I've noticed something with the collisions of cars onto other cars, objects and walls. They bounce too much when they collide. I know it's still WIP but it will be a good start to reduce this effect.

Oh, a new topic that isn't that useless for once, and actually trying to be helpful!
But that topic has been discussed hundreds of times before (think about it, S2 is out for some years now, with ten thousands of people playing over the course of time. How slim's the chance that noone ever noticed that?) So, I advise you to do a thorough search before starting a new topic, possibly with different key words, to increase the effect.

Also, Scawen already announced that he'd like to get rid of that before S2 leaves Alpha status, so he is, or will be, working on that.