I know it's been a few months, but I did make a few of your suggested changes.
1. I changed the emote list to be left-aligned. Categories are still centered because I think they look better that way.
2. I fixed the annoying multiple mouseover issue. I agree that it was annoying, and it was a bug that I'd been trying to fix for a while.
I am currently looking at re-sorting the list by world impact (AV, then V, then A, then chat only). I'm essentially just pulling it from a data table, so it should just be a matter of re-sorting the data accordingly.