Facelifts?
I'm going to give only one of my ideas as it's a pain to write from my phone.
Ok, here is my main annoyance - car design.
Say I have an econo-box that I'd like to turn into a hot hatch, and I want to add flared arches, change the grille a bit, that sort of thing. In order to do that, i need to basically start from scratch, as body shape changes require reset of all fixtures. Or I want to have a minor facelift, but I want to keep my current car setup.
Basically all I'm proposing, is making body change and fixture placement a part of model design instead of chassis design.
Overall, I'm enjoying this game and can't wait for the release!