I'm loving the new tag pane, and the ability to sort the tags!!!
However the tags on completed items still show up in the tag pane, which muddies the value since the list is polluted with tags that aren't entirely relevant. Not completely irrelevant either.
So it would be nice to have a toggle to exclude completed item's tags, at the top of the tag pane where it's quickly accessible. I use my tags for projects (hash-tags) and people (at-tags) so if there's no tags in the tag pane then it would mean I have nothing to do right now for that project or person!!!