- This is what I discovered after months editing those text files.
- After many tests, I realized that some parameters change more than one location. It's hard to say how many places are changed per parameter, but what I can say is that you need to be careful while modifying them. To make the guide easier and more intuitive, I put a "!" symbol at the end of the name of each parameter that I consider "dangerous", I hope it helps!

C = Cutscene exclusive line
M = Appearances in missions
! = "Dangerous" lines

Timeyc Modifiers 1

"noambient" and "NoAmbientmult" > These seem to be "base" parameters for certain regions, some places are affected, others not, anyway, I do not know how to explain accurately, I just know that if you change too much, your game could get ugly. I recommend not touching them. !
"qwnomoon" > ?
"qw2nomoon" > ?
"Brook_S2_TC" > ?
"MH_NOMOON" > ?
"KsS1nomoon1" > ?
"KsS1nomoon2" > ?
"KsS1nomoon3" > ?
"Brook_N_gden " > ?
"Buildsite_MH1" > ?
"MH3carpark" > "Purgatory" Parking Garage - Purgatory, Algonquin. !
"bkn2_Nomoon1" > ?
"bkn2_Nomoon2" > ?
"bks3norain" > The only thing I know about this parameter is that it affects some train station (I tested near the Airport.) and also affects the Carpark in Percell Road - Alderney. !
"MHNoMoon" > ?
"erosware" > ?
"QM_Nomoon" > ?
"NJ2nomoon" >Alderney Area. (Also affects the Alderney Safehouse.)" ! 
"bxwnomoon" > ?
"star_junc" > Star Junction  - Algonquin (Time Square.)
"raytest" > ?
"raytest2" > ?
"NJ02TUNNEL" > Booth Tunnel - Alderney (M: "Tunnel of Death" - Derrick McReary.)
"Internaldim" > ?
"SoosTunnel" > ?
"Nikwarehouse" > ?
"clam" > The Triangle Club - Northern Gardens, Bohan.
"vlads" > Comrades Bar - Broker (M: "Clean Getaway" and "Uncle Vlad" - Vladimir Glebov.)
"generic" > ?
"jamcafe" > Homebrew Café - Beechwood City.
"ten_str" > Apartment of drug dealers. (M: "Shadow" - Jacob Hughes/Little Jacob.)
"playboyx" > Playboy X's Penthouse - Northwood, Algonquin. (M: "Deconstruction for Beginners" - Trey Stewart/Playboy X.)
"browner" > Oleg Minkov's House - Hove Beach, Broker. (M: "Wrong is Right" - United Liberty Paper.)
"limo" > ?
"STEVETUNNEL" > ?
"SUBWAY" > Subway.
"SUBWAY_STATION" > Subway Station.
"CARPARK" > ?
"RomansFl" > First Safehouse of the game - Broker. (M: "The Cousins Bellic" - Roman Bellic.)
"rscafe" > SuperStar Café Restaurant.
"bernies" > ?
"Factorytest" > ?
"Factory" > Abandoned Xero Gas petroleum company - Bohan. (M: Rescuing Roman in "Hostile Negotiation" mission.)
"bens2" > House of drug dealers. (M: "Concrete Jungle" - Jacob Hughes/Little Jacob.)
"Hospital" > Schottler Medical Center - Schottler, Broker, and Westdyke Memorial Hospital - Leftwood, Alderney.
"Museum2" > The Libertonian Museum - Algonquin. (M: "Museum Piece" - Ray Boccino.)
"bada" > Honkers Gentlemen's Club. (M: "One Last Thing" - Jimmy Pegorino and "Catch the Wave" - Phill Bell.)
"Badamine" > ?
"DrugDen" > ?
"Bank3" > Liberty City Bank. (M: "Three Leaf Clover" - Patrick McReary.)
"Chase" > Bucky Sligo's House - Alderney. (M: "Smackdown" - Derrick McReary.)
"sexshop" > The Peep Hole Sexshop - Hove Beach. (M: "Do You Have Protection?" - Mikhail Faustin.) (Also used in "XXX Shop (XXX Videos & DVDS XXX)" - Star Junction.) 
"Diner" > The 69th Street Diner - Broker. (Diner that Niko kills Thomas Rivas ["FrenchTom"].)
"hospitallobby" > ?
"Trespass" > Haunted Sprunk factory - Alderney. (M: "Trespass" - Phil Bell.)
"ritz" > The ground floor of the Majestic Hotel (Lobby) - Northern of the Star Junction. (M: "Late Checkout" - Ray Boccino.)
"ritzf3" > 24th Floor of the Majestic Hotel. (M: "Late Checkout" - Ray Boccino.)
"ritzpen" > ?
"intcafe" > TW@ Internet Cafe.
"firedept" > Liberty City Fire Department.
"deal" > Lyle Riva's house.
"korrest" > Mr. Fuk's Rice Box Korean restaurant - Alderney.
"korbar" > Entrance of the Mr. Fuk's Rice Box Korean restaurant (Lobby).
"korkitch" > Kitchen of the Mr. Fuk's Rice Box Korean restaurant.
"apart" > Drug dealer apartment of the "Lure" Building. (M: "Lure" - Francis McReary.
"parktoilet" > Public toilet in the Middle Park - Algonquin.
"HarlemProjects" > Governor Greg Johnson Houses - Northwood, Algonquin.
"HarlemDrug" > ?
"JerSave" > Entrance of the Alderney Safehouse.
"burgershot" > Burger Shot (Fast food).
"burgershotold" > ?
"HarlemTopFloor" > Top floor of the Governor Greg Johnson Houses. (Look to the sky to see the difference when editing.)
"Irishbar" > Steinway Beer Garden Irish Bar (Darts) - Steinway, Dukes. (Share the same interior with the Lucky Winkles Bar - Purgatory, Algonquin.)
"boatcabs" > Platypus. (The Platypus was the cargo ship that brought Niko to Liberty City.)
"corplobby" > ?
"binco" > Clothing stores: Russian Shop, Modo and Perseus. (Also affects the Laundromats.)
"gazwarehouse" > Chase Point Warehouse - Chase Point, Bohan. (M: "Escuela of the Streets" - Manny Escuela.)
"bruciechopshop" > The Garage of Brucie Kibbutz.
"playboyxlobby"> The ground floor of the Trey Stewart/Playboy X's Penthouse (Lobby) - Northwood, Algonquin.
"statuestair" > Lobby and stairs under the Statue of Happiness - Happiness Island.
"waste" > Waste Management Plant - Colony Island. (M: "Waste Not Want Knots" - Patrick McReary.)
"Bowl" > Memory Lanes Bowling. (M: "First Date" - Karen Daniels/Michelle.)
"GunShop" > Gun Shop of Downtown - Broker and Port Tudor - Alderney.
"chinagun" > Chinese Gun Shop - Chinatow, Algonquin.
"harlem_ten" >  The two buildings of the mission "Lure" - Francis McReary. (Also affects many buildings in North Holland that share the same interiors.)
"sw_har_decor" > Affect some East Holland buildings that share the same interiors.
"sw_har_psh" > Affect one East Holland building and affects one Middle Park East building.
"ten_standard" > Building that have the "ten_str" room. (M: "Shadow" - Jacob Hughes/Little Jacob.) (Building in front of the Bohan Safehouse where the "preacher" sometimes appears.) (Also affects many others buildings in South Bohan that share the same interiors.)
"ten_ornate" > Building of the mission "Luck of the Irish" - Elizabeta Torres. (Also affects a building in Chase Point.)
"ten_modern" > Building in Alderney of the mission "Ransom" - Patrick McReary. (Also affects some buildings in Leftwood that share the same interiors.)
"cluckinbell" > Cluckin' Bell (Fast food).
"Casino" > Abandoned Casino - Alderney. (M: "Out of Commission" [Revenge Ending] and "A Revenger's Tragedy" [Deal Ending].)
"limooffice" > 
"DrugDenStair" > Building of the mission "Blow Your Cover" - Elizabeta Torres.
"project" > Westminster Towers - Galveston, Algonquin. (M: "A Long Way to Fall" - Ray Boccino.) (Also affects Theodore Benavidez's apartment.) 
"DwayneApart" > Dwayne Forge's apartment. (2th Floor of the Governor Greg Johnson Houses, counting the ground floor.)
"stair1" > Building - Benchwood City. (Near of the Homebrew Café.) (The door is broken up.)
"stair2" > Exit stairs in the building of the mission "Blow Your Cover" - Elizabeta Torres. (Also affects a building in Schottler [Building next to Jacob Hughes/Little Jacob's house].)
"MH8_carpark" > Underground car park - Algonquin.
"MH8_Savehouse" > The ground floor of the Middle Park East Safehouse (Lobby) - Algonquin.
"MH8_Showroom" > Grotti Showroom ("Turismo showroom") - Middle Park East, Algonquin.
"STUDIO_APART01" > Middle Park East Safehouse - Algonquin.
"projectStair" > Stairs of the Westminster Towers - Galveston, Algonquin. (M: "A Long Way to Fall" - Ray Boccino.)


Timeyc Modifiers 2



"lightning" > Lightning when it's raining.
"playersettings" > ?
"playersettings2" > ?
"sniper" > ?
"sniper_ini" > ?
"binocular" > ?
"injured" > ?
"fast" > ?
"death" > ?
"death2" > Death screen by falls, bullets, crossings, combat melee, etc.
"death3" > ?
"train_int" > Cameras of the trains, when you enter a train.
"busted" > Busted screen when you get arrested by police.
"cabaret" > Perestroika Cabaret Club - Hove Beach, Broker.
"lobby2office" > Tom Goldberg Office inside "Goldberg, Ligner & Shyster". (M: "Final Interview" - Francis McReary.)
"lobby2" > "Goldberg, Ligner & Shyster" - Algonquin.
"Police" > ?
"SUBWAYENT" > Entrances to the Subway Station.
"SUBWAYSERV" > Emergency entrance to the Subway -  Easton, Algonquin.
"SUBWAY_N" > Underground Entrance/Exit (Train) of the subway. - North Holland, Algonquin.
"SUBWAY_E" > Entrance/Exit of the Subway that passes under the Algoquin Bridge.(Start: Lancet, Algonquin/End: Downtown, Broker.) (Affects another Entrance/Exit In Bohan.)
"SUBWAY_S" > Subway that passes over the "Booth Tunnel" - Purgatory~Westminster, Algonquin.
"SUBWAY_W" > ? 


Timeyc Modifiers 3

"NIGHTSHADE" > ?
"PIZZAREST" > Lobby and kitchen of the Drusilla's restaurant. (I don't know why but it affects the Bohan Safehouse O.o strange..)
"PIZZAREST2" > Drusilla's restaurant. (M: All missions of Ray Boccino except "Museum piece" which uses the "rb_4" line.) (Also affects a room in the "ten_modern" building [Hostage room].) (M: "Ransom" [Continuation of the mission "I'll Take Her" - Gerald McReary.] - Patrick McReary.) 
"BRUCIE_STUDIO" > Brucie's apartment. (M: "Easy as Can Be" and "Out of the Closet" - Brucie Kibbutz.)
"church" > Church. (M: "Undertaker" (Francis or Derrick) and "Mr and Mrs Bellic".) 
"Faustins" > Faustin's house (M: "Do You Have Protection?" and "Rigged to Blow" - Mikhail Faustin.)
"Faustinsbase" > Faustin's basement (M: "Crime and Punishment" - Roman Bellic.)
"LittleJacobs" > Jacob Hughes/Little Jacob's apartment. (M: "Shadow" - Jacob Hughes/Little Jacob.)
"Prison" > Visiting area of the Alderney State Correctional Facility. (M: "I'll Take Her", "She's a Keeper" and "Diamonds Are a Girl's Best Friend" - Gerald McReary.)
"BernieCrane" > Florian Cravic's (Bernie Crane) apartment - Ivy Drive South, Algonquin. (M: "Hating the Haters" and "Union Drive" - Florian Cravic/Bernie Crane.) 
"McRearyHouse" > House of the McReary family. (M: "Harboring Grude" and "Waste not want knots" - Patrick McReary.)
"CopshopOffice" > Francis office (M: "Final Interview" and "Holland Nights" - Francis McReary.)
"Michelles" > Karen Daniels/Michelle's apartment. (M: "First Date" - Karen Daniels/Michelle.)
"sopranos" > Jimmy Pegorino's house. (M: "Payback" and "Pest Control" - Jimmy Pegorino.)
"Manny" > West Bohan Community Center - South Bohan, Bohan.
"CIAoffice" > United Liberty Paper office. (M: "Wrong is Right", "Portrait of a Killer", and "Dust Off" - United Liberty Paper.)
"portacabin" > Phill bell's offcie. (M: "Truck Hustle" and "To Live and Die in Alderney".)
"comclub" > Split Sides comedy club.
"elizabeta" > Elizabeta's apartment. (M: "The Snow Storm" - Elizabeta Torres.)
"Bada" > ?
"fau3_a" > Mission "Final Destination" - Mikhail Faustin. C
"imbhst" > Mission "Three Leaf Clover" (Bank scene) - Patrick McReary. C
"em_4b" > Mission "Blow Your Cover" (Scene of the exchange) - Elizabeta Torres. C
"g_1" > Mission "Entourage" - Jon Gravelli. C
"g_2" > Mission "Dining Out" - Jon Gravelli. C
"g_3" > Mission "Liquidize the Assets" - Jon Gravelli. C
"em_4" > Mission "Blow Your Cover" - Elizabeta Torres. C
"df_2" > Mission "Ruff Rider" - Dwayne Forge. C
"df_3" > Mission "Undress to Kill" - Dwayne Forge. C
"lilj1_a" > Mission "Concrete Jungle" - Jacob Hughes/Little Jacob. C
"imfau6" > Mission "The Masters and the Molotov" (Perestroika Cabaret Club) - Dimitri Rascalov. C
"imfau2" > Mission "Do You Have Protection?" (The Peep Hole Sexshop scena)- Mikhail Faustin. C
"wedint" > Mission "Mr and Mrs Bellic". C 
"gm_2" > Mission "I Need Your Clothes, Your Boots, and Your Motorcycle" - Gerald McReary. C
"br_1" > Mission "Search and Delete" - Brucie Kibbutz. C
"br_4" > Mission "No. 1" - Brucie Kibbutz. C
"px_2" > Mission "Photo Shoot" - Trey Stewart/Playboy X. C
"pxdf" > Mission "The Holland Play" - Trey Stewart/Playboy X. C
"rb_4b" > Mission "Museum piece" (Scene of the exchange) - Ray Boccino. C
"vla1_a" > Mission "Bull in a China Shop" - Vladimir Glebov. C
"vla2_a" > Mission "Hung Out to Dry" - Vladimir Glebov. C
"vla4_a" > Mission "Ivan the Not So Terrible" - Vladimir Glebov. C
"rom8_b" > Mission "Uncle Vlad" (Comrades bar) - Vladimir Glebov. C
"pm_3" > Kitchen of the McReary's house. (M: "Three Leaf Clover" - Patrick McReary and "Actions Speak Louder than Words" - Gerald McReary.)
"em_1" > Mission "Escuela of Streets" - Manuel Escuela/Manny Escuela. C
"em_2" > Mission "Street Sweeper" - Manuel Escuela/Manny Escuela. C
"em_3" > Mission "Luck of the Irish" - Elizabeta Torres. C
"em_5" > Mission "Puerto Rico Connection" - Manuel Escuela/Manny Escuela. C
"em_7" > Mission "Have a Hearth" - Elizabeta Torres. C
"fau4_a" > Mission "No Love Lost" - Mikhail Faustin. C
"show_1" > Perestroika Cabaret Club Apresentation 1.
"show_2" > Perestroika Cabaret Club Apresentation 2.
"show_3" > Perestroika Cabaret Club Apresentation 3.
"show_4" > Perestroika Cabaret Club Apresentation 4.
"show_5" > Perestroika Cabaret Club Apresentation 5.
"show_6" > Perestroika Cabaret Club Apresentation 6.
"show_7" > Perestroika Cabaret Club Apresentation 7.
"show_8" > Perestroika Cabaret Club Apresentation 8.
"rb_4" > Mission "Museum piece" - Ray Boccino. C
"j_1" > Mission "Pegorino's Pride" - Jimmy Pegorino. C
"rp_13" > ?
"rom2_a" > Mission "It's Your Call" - Roman Bellic. C
"rom3_a" > Office of the Express Car Service/Bellic Enterprises. (M: "Three's a Crowd" - Roman Bellic.)
"rom5_a" > Mission "Easy Fare" - Roman Bellic. C
"rom6_a" > Mission "Jamaican Heat" - Roman Bellic. C
"rom8_a" > Mission "Uncle Vlad" (Roman's office). C
"r9" > Mission "Logging On" - Roman Bellic. C
"Classic" > ?
"Tweaked" > ?
"Cinema" > ?
"Verte" > ?
"Hot" > ?
"Steel" > ?
"Psyche" > ?
"Romantic" > ?
"Sepia" > ?
"Muddy" > ?
"Neon" > ?
"Rouge" > ?
"Bronze" > ?
"Ulraviolet" > ?
"Eclipse" > ?
"Noire" > ?
"colors" > ?
"Vintage" > ?
"Fire" > ?
"Sketch" > ?


Timeyc Modifiers 4

"em_1" > ? 
"em_2" > ? 
"em_5" > ? 