A simple addition to this game that I think would be great.

Allow the player to choose a garage preset on the post-game menu in privates, it's kind of inconvenient having to get out of the private, quit the party, change the car and then get invited again. That, or being able to join a private game without having to be invited again.

It could also work for casuals and ranked, mostly casuals because you can keep playing against the same team as if it was a private, so maybe you wouldn't want to quit to change preset. In ranked it wouldn't matter that much because you have to quit the post game menu either way.