Upvote this into oblivion and beyond.
Also, perhaps lower usage of gasoline? An experienced driver knows more or less how a well-maintained car should operate, and how driving can affect various parts of the car itself.
Nice idea, but it'll be inificient if you happen to change your mind in the middle of the game. There would also be various trouble reconizining friendly players... This should be a yes if you could customise your character even more.