In Squid for Android (formerly Papyrus), they used the combination of pen strokes & pressing the side button on the Samsung S pen to do cool stuff. For example:
- side button + swipe left: undo
- side button + swipe right: redo
- side button + swipe up: color/thickness pen palette
- side button + swipe down: tool selector (pen, highlighter, stroke/pixel eraser, shapes)
The undo & redo gestures particularly are much faster & more reliable than the scratch out gesture & reaching for the undo/redo button.
This would be awesome! I hate it that there is no undo button directly on the pen.