A really random idea, but when watching a video someone had made on beam ng an engine sound was off/corrupt making it sound like a squeaky fanbelt and I though huh it be neat if the old beater cars has squeaky fan belts that changed tone depending of rpm. Then I thought it be cool if you could toggle things like that such on the vehicle settings like squeaky fan belts, blown head gaskets, damaged/Smokey exhausts,misfires, electrical gremlins, ect instead of having to damage the car by driving it into things you could start the problem yourself. Something similar to flight simulators where you can toggle faults and failures.