So here's how I've set things up:
Nothing pressed: My DEFAULT touchbar. It shows batery, date, time, outside temperature and desktop spaces.
CMD: Brings up APP SPECIFIC touchbar
OPT: Brings up INTERFACE CONFIG such as Keyboard Brightness, Brightness Slider, Volume Slider, Mute, and media commands
CTRL: Brings up MACHINE CONFIGURATION airplane mode, toggle voice commands, toggle GPU, Locks Scree, etc.
FN: The default F Key layout
Anyway, currently this is all done manually of course. What I'd like is to be able to group these into a specific modifier key, for ease of configuration if not anything else.
I'm not a coder but I would venture a guess that this would also make layout switching more responsive.