I think, it would be cool, if you could drive 2 or more cars synchronous. It would be really cool if they implementing that maybe in further versions, if the developers have time for the fine polls of the game. Thanks in advance for reading this thread
Some scripts that have been posted already allow controlling how an other car behaves (where it goes etc...). It might just be not much more to get one to mimic the player car. That can already be done with lua without the need of the game developers. Just some community members.
I don't think there is. But you do know about the chase/flee AI in the game right? That way you can run from or chase another car.