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Hanging on the rim is ok if they're trying to avoid injuring themselves/others. (the exact wording of the rule is different, but that's spirit of the rule)
So if there are other players in the 'landing zone' or if the dunker winds up being momentarily off-balance as a result of dunking, handing on the rim is acceptable.
Showboating, doing chin-ups, etc, are all disallowed by rule.
My personal opinion: If the dunk is in a crowd, I'm more likely to give leeway for a momentary rim-hang. If it's on a breakway, less leeway assuming he's not off-balance.
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