It would be great if we could customize the fields that appear on the Tags tab of the Tag Editor. This could save a lot of clicks for those of us who have edit metadata in the [...] splitters or on the Tags (2) tab.
For example, I would add Guest Artist, Performer, and Remixer directly below Artist since I often have to edit those fields, and I would remove Conductor since I've never used it. I'd also add Language and my custom tag for Explicit.