Currently I have my touch bar set up in a way where sliding with 1 finger anywhere = adjust volume, sliding with 2 fingers anywhere = adjust brightness. It's super awesome and it would be cooler if I can: slide with 1 finger on left half of the touch bar to adjust volume, slide with 1 finger on the right half to adjust brightness.
Also, there's a bug where modifier key + swipe with 1 finger doesn't trigger. I wanted to do 1 finger swipe for volume adjustment and cmd + 1 finger slide for brightness control but I like the left half/right half idea much more. I hope this can be implemented