We could certainly try, but there are some cars with few, or only one skin - Gallardo and the McLaren I believe - and we don't want to stop multiple people from choosing these cars. However, most of the other cars have quite a few options, so we can give it a go. And with the ability to change cars whilst on the server it should make this easier. This, for the record, I shall almost certainly be taking out the #50 F458.
Whilst we're on this point, I'll just say that we might look into introducing some more default skins for the next round.