Affinity Photo registers single touch inputs as a brush input. This is not ideal when using the software on penabled devices. Computers with an active stylus (i.e. Surface, Cintiq) let users rest their palm on the screen while using the pen, but the technology is not perfect and occasionally there are glitches where computer registers users' hand as a single finger touch input. It results in small dots and strokes all over the canvas, and it is quite frustrating to see your work speckled with these glitches after merging all the layers. It is also troublesome during the normal use as well, because you occasionally end up with unintentional lines when you just wanted to pan the canvas and unconsciously attempted to do so with only one finger as you do on many other apps.
It would prevent a lot of frustrations if you could add an option to make the software react to single touch input differently rather than a brush input, for example, pan, brush size, or just do nothing.