Coach asked a question

[Adam]

The only thing you could add is that the rules don't address making the rim vibrate by hitting the backboard. It's perfectly legal, as long as the slap was part of the follow through on a block attempt.

You may want to point out that in order to make the rim vibrate by slapping the backboard may very well be to hit it hard enough to break the hand of the slapper. I would argue that, at the very least, one would need to hit it awfully hard in order to make it vibrate enough to affect a shot. And if it's slapped that hard, it would be pretty easy to call it a T.