When adding new recordings from the release editor, it is not possible to assign a disambiguation comment to them. The workarounds for this are to add the recordings beforehand or to edit all recordings afterward, both of which are very cumbersome.

The primary use case where I'd need this feature are remasters and clean/instrumental versions of albums, but it might also have some use for soundtracks, DJ mixes and classical releases.

Somewhat related to and possibly a prerequisite for MBS-5593, though that ticket is specifically for batch adding comments.