Be able to not count a vote in the grade without deleting it or marking all as correct.
I almost always have students vote twice (first individually and second time after peer discussion). When they do really poorly on the first vote, I like to not count it toward their grade. However, to do that I have to delete that entire vote's data. I would rather be able to keep that data so over time I can see the data for questions that students are struggling with on the first vote. So it would be great if I could make that first vote not count toward their grade but still leave the data in there. I know I can just mark them all as correct to give them points for that first vote, but I'd rather not do that because I just want their grade based on the votes that I want to count.