So what about if we had two voting powers, one for comments, and one for everything else. Voting on comments would not effect your voting power for everything else where you could earn curation rewards, but would decrease your comment voting power (to keep comment rewarding fair)?

This way voting on a comment would not be a wasted vote, but something extra that you can choose to do with out losing out on curation rewards. Aka make it so there is no reason not to vote on comments.