Well, I'd say it depends on the channel and how the ops get along, for whether it's rude or not. My channel allows all ops to unban anyone except those we have had real problems with. We have never really had any issues with allowing that. Usually no one will unban without asking what the ban was for, anyhow.
But, if the ops all know the bans will only last 15 minutes, then they can either complain or accept it. Of course, the ops could simply add -u900 to their bans and they'd unban their own that way.
