Okay I still don't understand this need for "realism" with accidents... I don't have accidents in real life and hardly every "wreck" in the game. If I go off course the car spins out, rarely contacts anything, so would cause a flip?
Watching "Setup" season 2 on Speed, in the next to last episode one car got clipped in the right rear wheel, spun the car left sideways but the initial contact upset the balance of the car (left to right) and it barrel rolled about 6 times before coming to a rest on its side.
In all the years I have watched mainly production car racing (open wheel is just okay), about once a season there is an accident in which a car gets air borne. Not enough for me personally to warrant putting this feature in the game.
I keep saying and I'll keep saying it accident damage is overrated. Should you be penalized for making hard contact with a solid object? Yes, should it result in body damage modeling? I don't think so... In PRD (Pro Race Driver) games you make contact hard enough to punt a car out of the way and it blows out the windshield and crumples the hood; That's unrealistic... When they make contact like that in touring cars, do you see the hoods fly up and the windshield smash into little bits? NO, so why would you expect this kind of damage in a game like GT?
If you want a true sim, PLAY one.