Hmm, that is an interesting idea...
I might look into this one. Would something like voting buttons in the crosspost dropdown be an acceptable alternative? I think I would prefer to keep 1 action (click) means 1 vote, but making it easier to vote on crossposts makes sense with the way that piefed consolidates comments.
So, voting buttons here maybe? (no promises, just an idea) -
Yeah, that should work then. I haven't really looked at that portion of the code, but I can try to take a peek.