I really think that would be a bad idea, at least for now. Since the damage isnt perfect for now, cars that hit a wall fly all over the place and spin wildly. In real life they would break into pieces, and stop spinning much sooner.
Oh yes, this mainly aplies to the oval, other tracks are less dangerous.
And when im testing setups, I pit a lot, stopping the car everytime before I can pit isnt funny.