Jim,
Henry is great, no doubt. I specifically mentioned more mixer tracks request here, because it would do good to people like Henry (me, and whole bunch of people). Our method (of saving multiple copies of project in BIAB ->Cakewalk) are very close. I do not use social media, except for couple of forums. I am sure there are many PG software users who are not here.

Unlike the aim of "production".... where you can make a load and a little basket of "regenerations" and do all kind of surgeries, I prefer just simply listen and try variations one by one (similar to Henry). If more mixer tracks happen, that would solve the issue of transplanting RT's to DAW before due date, copying the project over and over again just to keep minor changes. Making it possible to audition and compare tracks side by side in the content of arrangement / freeze tracks on the fly and many other good things, like use extra RT tracks for elements, which Henry talks about. I am not saying it is not possible to achieve with a "workaround", I am saying it will make a lot more room for creative part of the process.

Matt:
" but using MME for BIAB is generally a safe choice."
Well, I feel it would be a downgrade when using interface(s) specifically designed to be used as ASIO devices. In my experience most of the time when I try to push Wasapi (shared or exclusive) or MME driver onto ASIO card, I get nothing but headache. Just doesn't work right.