First of all I think what you have accomplished here in parallel with hardware vendors is phenomenal.
CD metadata is known to be flaky. It's a problem in the industry. I transferred a file directory with Aerosmith Greatest Hits to a thumb drive. When RA library was updated the first track was orphaned into a unknown album. This happens a LOT so this is not a particular fault of any one vendor it is a manufacturing problem with CD's. In the past I have reconstructed metadata records for such cases. I use AlbumPlayer on PC Windows which is a very nice system. Inevitably the orphaned tracks are given generic titles "Track 1" when the actual file on the disk typically has the correct name for the track.
I propose a feature such that when an orphaned track is detected the track is assumed to be a part of album if that exists and that the title used is the filename on the disk. This automatic name and album association would be one step closer to a better solution for a real problem.
Perhaps this has been addressed. I don't see a way to correct metadata.
Thanks ... again ... I am truly impressed with this system.