Thats the sort of thing i was on about. Depending on X, Y, Z the car will do A, B, C. Their's enough reference on the net, like the link you posted, that could be implimented into any car, no need for smashiing any other cars up.
Anly other factor would be that each car will have its own engine (as in motor engine with pistons and head gaskets, not a physics engine) and that might take some time to model and code and stuff, along with other things that would be needed to make any crash look half decent.