The way I got round this is by using another hack in here to moderate users.
That way, if somebody signs up, every post is moderated until we're happy with them. Then, they're free to post immediately.
With this, and a realisation that most users, even when signing up yet again, use the same password (dur!), we've completely eradicated those that want to cause trouble. Those that sneak back in again and behave... well, they're no problem any more.
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