The Rec league I played for and officiated for had a strict policy of no dunking...either before or during the game. In fact the League Administrator wanted anyone dunking or hanging on the rim ejected.
The Rec league used middle school gyms around the city. These gyms usually did not have "break away" rims. Therefore, any damge to the rims had to be paid for by the league...also it wasn't good
PR to have a bent rim the day after a Rec game and the school having to play a game.
Edited: The Rec League had this rule of "rim hanging" ejection spelled out in the set of rules each team received at the start of the season.
[Edited by RookieDude on Jul 19th, 2004 at 11:14 AM]