I would love to have this. Also, I want it to affect AI, ie they get into the wall, they suffer the same consequences and have to pit for repairs. It would be so awesome for endurance races... make a mistake and you have to decide whether to pit right away to get it fixed or try to limp around for the rest of your stint.
I would also love to hear an explanation for why they took carry-over damage out from the pre-release version.