Is it possible to Playback Swap between 1-10 and 11-20 by using a button press or combination of button presses on the M-Touch?
No, like the other hardware it is toggled on the UI
That makes it is a feature request. I wish there were an option to toggle the 1-10 and 19 through 20 from the device itself.
I also wish the four faders of the paramaters wheels could be used for controlling 11-14 or 1-4 respectively.