This mod adds the ability to leave the car without turning off the engine.
You will be able to go right after landing in the car, and this can help in missions, etc. Especially if the car is in poor condition (It may take longer to start, or not start at all)
INSTALLING 1) Have Script Hook V 2) Have LUA plugin 3) Transfer the contents of the folder "To the directory with GTA: V" in fact, where it needs to be.