I may add:
In the Sketcher, a press of the joystick should switch between eraser and stylus. It currently appears not to be bound and switching to the eraser is needed in a more convenient fashion.
And, as this as basically been ignored in the thread where I posted it, I wish the reader controls were streamlined and more consistent. Currently, most options are non-orthogonal which makes it difficult to achieve what you actually want. In particular, auto-crop (=hide margins) should make each individual page behave exactly as if it did not have said margins.
Also, the Sketcher discards all changes (everything gets lost), when the device goes into power-safe. That musn't happen.