Mario, Jeff.
It's funny, but today somebody in Cakewalk forum asked a BIAB related question. RT>MIDI.
The standing problem is that while you can extract chart, it doesn't take further regeneration once RT is deleted. I've requested this feature before, but I don't believe most people understood what I was talking about.
To be able to work with RT underlaying MIDI by itself. So it not only responds to further chord changes, but does partial regens as well. That is quite a big chunk of MIDI content that can be used quite differently. Since the MIDI counterpart functions are already in the code and currently work in tandem with many RTs, we really (really!) need to ask PGM to have a way to
toggle between the two the easy way. That is in my view falls under enhancing workflow of
existing feature. Making process
less complicated

Once you are done with your partial regenerations, just drag MIDI track to DAW directly from header.
This is what you can do
now (Cakewalk adds extra tracks, I am not sure if it's specific to Cake) :