This fixes two issues and would be in general seriously useful for many I suspect:

• Tagging merged files:
      For example in these real life scenarios:
      - Having an Audio drama as a single file to get it playing effortlessly til the end on a dumb car stereo but still wanting cover-art embedded effortlessly
      - Tagging the audio file that contains the entire album that the artist-uploaded 
      - Tagging vinyl rips (this was brought up on the forums) that really don't have a noticeable gap between the tracks

• Makes it possible to tag audio files that don't yet have a tracklist on MB - Just as a workaround until it actually gets added