What if each time you commented, you got the ability to vote once?

You still can't stuff more then one vote onto any post, though.

Basically, it puts emphasis on commenting as the main method of community contribution, as opposed to voting. It also absolutely kills vote bots and vote spammers (both of which have plagued GD), since they won't be able to keep voting without making posts that would reveal them as bots or spammers.