It works for me! The only issue I see so far is that when I have the tag editor in the main panel, save a change and then undo it, the contents of the tag editor don't go back until I refresh or rescan the file.
I trust it will be possible to assign this to a hotkey once it's been tested for a while? (Is there a hotkey for saving changes in the tag editor? If not, that would be awfully nice, too.)