Hi jpickerell,
Since at least beta build 5586 WACUP has been providing audio CD tags in the media library Audio CD view. The tags are downloaded from the MusicBrainz database and include the type, disc #, track #, artist, title, album, year, length, genre, album artist, category and publisher, if they are available. The available tags should appear automatically, but if not there is a Reset Metadata button at the bottom of the view. These tags can be edited for each CD and are stored locally in a special WACUP database file.