I've heard various ideas such as limiting it only after mods have expended their points (this will require implementing a cooldown to prevent a user from getting points again too soon). I want to hear your feedback, and I'll roll together something for the next major update of the site. Leave your comments
if someone is vidictively downmodding, it could be UGLY
Is it possible/feasible to prevent someone from modding the same user account more than once with the same set of points? I generally prefer the idea of making downmods "cost" more, or restricting them to only one or two downmods per set of points, but limiting downmods to a user could also be considered.