how about "Ignore"
Did you try the Ignore User hack?
Since the abuse generally abuse for reactions, if no one sees their crap, they tend to move on.
So, instead of using a strong arm attempt to 'ban' them, you use a psychological ploy (with the help of the hack) to ignore. If the community ignores the loser, the loser tends to get bored and moves on.
It's a slow process, because most users have difficulty ignoring these dopes.
This is how it's done in some newsgroups. Every newsgroup tends to get hit every now and then by the 'Trolls'. They stir up a mess and leave everyone shell shocked. And the most effective tool was ignoring them.
Think back (alright, some of you don't have to think back too far)

to when you'd "Ring and Run" on someone's door. If no one came to the door, you wouldn't hit that house again. But when someone came to the door and started screaming at you.... well, 'Hey, that was fun, let's do it again'.