I believe it's an oversight that the forward and back buttons (for folder navigation) can't be mapped to gestures. I wanted to map gestures to what's normally the back key and then map swiping right to forward and swiping left to backward. Fot whatever reason forward can be chosen as a swiping gesture (it doesn't seem to work though, maybe it's like a media control forward/next title?) but back is not available. Please make those two functions available as gestures as it would offer the option of mapping much more functionality to the MX Master and even free up an additional (the forward) button.
Looking forward to hearing back from you,

kind regards

Janis Robens