If this already exists then don't hesitate to embarrass me for missing this, but I think it would be really neat if one could select an option to automatically display all tags in the files loaded in the application display window, regardless if I've manually created a column to display each and every tag in the files.
Context: I subscribe to a bunch of different podcasts, and I frequently need to review tags to clean up sloppy or inconsistent tagging by the podcasters. All sorts of random tag names pop up even from long-established podcasters, so currently I need to manually enter a new tag column to look at each and every new tag to see if it's garbage or if it's another tag that was mistakenly renamed by the podcaster. It struck me that I could save a bunch of time if I could select between displaying the tags that I have already entered and chosen to display (what Mp3tag does today and makes sense as the default), or select to display all of the tags embedded in the files I'm working with even if the files contain tags that are not currently manually entered in my column display selections. This second option would eliminate the need to manually create columns for each new random tag and then delete each column after cleaning up the files.
If this does not make any sense, I'd be glad to clarify. If this seems useless, don't hold back. But if this seems helpful, that would be good to comment on as well.