If I may add a suggestion - why don't you single handedly approve accounts.
Once they're registered, an admin or a mod has to approve the account - just check the hostname of his IP, and you should be able to tell whether it's him. (should be some similarities between his old IPs and the new ones)
We do have a custom hack I won't go into the details of but even if we did approve every account it would still be hard to tell which were legit and which weren't.
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