(D) Could there be a "Resubmit" function per error message? Maybe on the right-click menu where in addition to "showing in the playlist", there would be an option to "Re-queue as before". This would be a convenience in the cases of time-out and read errors. It would be even more convenient if the message queue could be sorted by error type ("C" above) so that all of the same error types would be together.
The errors I'm particularly looking for in this case are the ones that say "java.net.SocketTimeoutException: Read timed out" (example shown in attached image above) and "java.io.FileNotFoundException:" followed by a filename like "C:\Users\Richard\AppData\Local\Temp\copy6362950677360790880.mp3". These are all mixed in with the "Unable to find MusicBrainz ID" errors which makes them hard to find.
I've discovered that if I just run the same analysis on the java error tracks again, they will process successfully.
I guess ideally there wouldn't be time-out or file-not-found errors. But that is something probably beyond anyone's control.