Does the mod she’s concerned about actually unlock a feature that’s already built into GTA: San Andreas or does it add a new feature that was not originally built into the game? If it’s the second case, this would set a very dangerous precedent. Someone can come up with a similar mod for almost ANY game. Almost all modern games are data driven, with the actual executable fairly small & generalized and all of the game play specifications & graphics in data files that can be easily changed. A lot of games are written in an interpreted language, so new levels & actions can be added without too much trouble and without patching any machine code. There are already hundreds of mods for The Sims, Doom, Quake, and others which change their appearance or operation.