Down vote box pops up, 5 check boxes available. Pick one. Example:
Box one: Plagiarism (Author takes full hit of down vote)
Box two: Spam (Author take full hit of down vote)
Box three: Excessive rewards (Top five up voters take full brunt and receive no curation rewards).
Box 4 and Box 5 can be what others want, the three above are the ones I feel most strongly about.
I like that idea. It seems like a winner to me. I don't know about the mechanics or coding that'd be involved, but at least it promotes less destructive behavior.