More manipulation of body and chassis?

I feel that the car designer is missing freedom to change the body and chassis of the car. For example, you can only change the body a little bit, and you can't change the wheelbase and other important specs. I assume that it will be implemented in a update, but I just want to ask someone more knowledgeable about it. Besides this, the game is great, and I can't wait to see new features as they are implemented.