Not to be confused with pencil 2nd gen ‘double tap’
I think it would be really awesome to have this gesture activate a brush radius shortcut that you can adjust with horizontal movement after the second tap - when you click on an empty area of the viewport.
Only speaking for myself - but I’m 99% of the time I’m working one handed. That last 1% is used for the masking gestures (which i love…whoever thought of that: big thank you!)