Merge / Comments as votes
For us, merging two similar posts is essentially the same as creating another vote. However, I don't see how to do that. As an admin, I'm limited to one vote.
I also will manually add a comment to a post, to register some feedback I get through another channel; this essentially is an upvote.
But there's no way to sort by 'net activity', or for me to add more than one vote for each of these actions.