1. I think this might cause some problems. Or maybe I misunderstood what you meant?
2. Sorry! It's already been toned down a bit in the next update. It was never intentional and is just a side effect of the wheels hitting the barrier before the chassis of the car.
3. More customization in general would be really cool! Such as different spoilers and wheels. The next update miiiiiiiight have some more color patterns to choose from but most likely not since I already have a lot of stuff to do for this update. Very likely in the next update after that though!