I have been reading the Beets FAQ and have come up with a config.yaml file which currently meets my needs. I still need to make it use disc subtitle info in the path with multi-disc releases but I have time to figure it out while I import all my music into the library.
I realize that this is totally off topic...but:
I've just been sidetracked by trying to determine the exact url the plexupdate plugin is using to send to the Plex server since it actually works. If I knew the exact url I would be able to come up with a way to notify Plex when SickBeard gets done processing as their notification is broken and it seems like there is no longer anyone actively developing SickBeard to fix it with a solution using the authentication token which Plex now requires.
This really isn't the place for that discussion as it has very little to do with MetaBrainz.
As I have pretty much given up on maintaining my music library via MusicBrainz Picard and am focusing on figuring out Beets the topic of this thread is no longer something I care about. I would delete the thread entirely if I knew how to and/or had the authority to do so.