With all the MidiSuperTracks you should be able to snap them to any chord/scale other than what they were recorded to. With RapidComposer I can drop a MidiSuperTrack phrase into it and it will refit it to any chord/scale, it's high time Biab can be made to do this along with having an option to snap notes in the Piano Roll to chord/scale marked by colors.
Likewise the same could be done with RealTracks if PG did a deal with Celemony (Melodyne) so it could be integrated into Biab to work with the RealTracks only during the generate process, not any user added audio track, this way they would still need to purchase Melodyne proper for this.