"I agree that it would an enhancement to be able to toggle between midi and audio"

That's all that was actually needed to avoid all the negativity.
The rest is discussion. Can PGM do it? I think yes, because RT is a layer and underlaying MIDI is also a layer and they generate simultaneously. As I have shown by deleting RT, MIDI layer is present in TV. Will they do it? I don't know. I will put this request in when I come up with idea of how this can be done elegantly.

Yes, it would be far less steps to do raw work right in the track view for partial regeneration. Especially if you have several MIDI tracks that can be partially regenerated in same manner. Process is much slower if done in BIAB Piano roll and only can be done on a single track at a time. TV gives you a "map" of all.

Also, I am not sure why you mentioned Cakewalk. I just showed that you can drag BIAB's MIDI directly from track header to DAW, that was the purpose of demonstration.