lol, yesterday I heard about ones playing - you play like Oystrah (famous violinist), but the sound is wrong -)
The same thing with your "idea". It's kind a late for such ideas. Also, it was a discussion a few years ago - would the trucks become dirty, the answer was - no. So there is no reason to put trackwash into the game.
Buddy - let them release at least something, if there will be any other idieas for the game... my future children will play this game when I will be dead