It would allow for more advanced cars to be properly simulated. Some sort of scripting system perhaps, with a basic script by default, and people could add their own scripts. (sorry if this has been suggested before, but I didn't see anything about it)
From what I've heard there is going to be some sort of Lua coding per vehicle thing, which I assume allows custom parameters for particular vehicles. If so, it would be rather useful for simulating systems specific to certain vehicles, for example Nissan's ATTESA 4WD system
