Given what Jables has said, this sounds like the best feasible implementation for asteroids leaving craters. Might not make it into the game, but...
As someone in the other thread said, smashing vs cratering is probably better as a function of relative size rather than absolute value (that's how...
I like the cratering and will be sad if it goes away entirely. Like someone else posted, I really like partial destruction mechanics in general....
Separate names with a comma.