At the moment you can tap on some faces on the mask border to grow / shrink the mask.
But e.g. for this workflow the unmask option is not respected and it is not clear which face you have to TAP to grow / shrink the mask …
Maybe you can improve this a bit …
Tap on faces on the mask border grows mask - no matter which face
shrink mask when you tap on faces on mask border when UNMASK is on.
