Depending on how much you trust them, they could liberally delete comments, or knock them way down in their weighing. Of course, you run the risk of pissing people off.
Concurrently, you could use the votes (esp negative) of the users tracked and identified as described above as notifiers to the moderators. That way you leverage more volunteers, but with less power (and they wouldn't know they had it, either).
Concurrently, you could use the votes (esp negative) of the users tracked and identified as described above as notifiers to the moderators. That way you leverage more volunteers, but with less power (and they wouldn't know they had it, either).