The new musicbrainz picard qt tagger, supports tagging lots of new useful tags and stores them with TXXX frames.
PRETTY PLEASE add functionality to MM that can both read and write arbitrary/custom TXXX frames (and vorbis comments).
This includes being able to search and use the frames in auto-playlists.
Now, I do not expect to get specific drop down selection for every different custom frame type, however a search/query for 'custom frames' which would search all unsupported/non-standard/custom frames would be just super.
Further, it would be even more super duper if you could add your own personal TXXX frames. With this I could script a custom frame to add my own specific information and even some kind of unique track ID, date added, play counts, and so on.
This would be above and beyond the custom1/custom2/custom3 tags that MM already has.
I really want to be able to read/write/clear ANY and ALL found frames/tags with MM and not have to rely on other applications.
btw, here is the link to the tags that picardqt uses.
http://musicbrainz.org/doc/PicardQt/TagMapping
Support Custom Fields from other applications 'TXXX:'
Moderator: Gurus