Airchair
i'm not on mac so i cant comment much.
but heres an idea for you.
most people will also be useing a regular daw as well as biab.
once you have the song roughed out in biab theres nothing to stop you bringing
the traks into for example logic or dp. or whatever daw you use on mac.
and editing the trak there.
eg copying a piece of the drum trak over to the beginning of the song
from another part of the trak.and/or editing in the mac daw to arrange
the trak just how you want it.

retired puter engr....powertracks on amd......NICE !
"what is the black art of audio engineering ?"
my silly songs...motagator.com/bmanning
see my tips in the tips section.