Maybe it's just me, but wouldn't it be a lot easier to temporarily disable images? Instead of adding all of these features to complicate things for regular users and make them jump through hoops, just disable this feature until things calm down. And instead of deleting whatever new accounts this kid keeps making, just change the privileges of his account so that he can view the forum and make new posts, but nobody else will be able to see anything he says. Because his account stays active, he won't have to keep making new ones. And he can do whatever he wants (until he eventually gets bored) and nobody else will have to see or deal with him. It's a fairly common method of phasing out those persistent trolls who keep coming back.
