Yes, that would be it. It’s a planned feature cough -I’m quite busy these days, wouldn’t have time to do it myself.
But all the fundamentals should be in place…and if you’re planning to go ahead with this, I would be happy to help…
Thanks, added this now in a lame way into tuned shortcuts, line 1025++. Currently does not render any phrase notes into the front track, so only works for fake “C-4” phrases.
Looking forward seeing this within this tool 
EDIT: Also something fishy is going on, the result after rendering phrase + disabling the phase still does not seem to be identical, e.g. an instrument (with fake c-4 phrase) playing a C#6, applied with scale key G and scale “pentatonic major” will result in a C-6, but should be a B-5.