Is there a guide somewhere of how best to do this?
I presume one can "overdub" MIDI CCs onto the Melody and Soloist tracks, though I have yet to try that.
AFAICS, the "all tracks are equal" doesn't yet have them equal enough to do that on other tracks.
Here is a list of MIDI CCs:
https://www.presetpatch.com/midi-cc-list.aspxNote that some are universal like volume, pan, etc. But all the others are left up to the software program you are using. They can be assigned to a variety of different controls in your synthesizer/sampler/effects units. Common mappings include adding vibrato, or adjusting filter cutoff.
I can not answer your other questions as I do all of my MIDI editing in my DAW, Studio One Pro 5. My workflow is to sketch out a chord progression and style(s) in BiaB then immediately drag and drop them into Studio One.
I hope this helps.