This thread made me register because honestly, it's a really cool suggestion.
Plane crashes in games have always looked odd to me, but I never really thought about why that might be. It is indeed very silly to have planes just turn into a big piece of metal that rolls around after crashing. I really hope a developer sees this, I don't think it would be a terribly hard thing to change/implement and it would make the game so much better. Please look into it!