Two things about paint symmetry I'd like to see and one bug?
1 - allow odd numbers of segments without leaving one blank (this happens even with rotational)
2 - allow more than 12 segments, especially for mirrored symmetry

Also sometimes when I do something using paint symmetry it doesn't appear the same in all segments - like I went to erase a part I didn't like, but it was still there in one segment...
(I use 4.5 but if these things happen I'll likely upgrade... if not I don't really have a reason to because I mostly use ArtRage with paint symmetry)