How about an admin option to remove the ratings from a thread. Probably the best way to do it would be this. If you're logged in as a Moderator/Admin, it would detect that and give you an extra admin option "UnRate Thread" at the bottom of the thread - in the Admin Options. Maybe the option "Change/UnRate Thread" where a Mod/Admin could change the rating to anything desired, or remove the rating completely.
We use thread ratings to archive threads on my board, and by un-rating them we could keep from archiving the stuff that's worthless.
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