I often use the side button on stylus (the "right-mouse-click" button) wich let erase the last strokes, but there's a bug with some tools:
when clicking on the side button, it erase when I hover over the tablet (I don't touch the tablet with the nib)
This happens with:
Airbrush-Ink-rotring-oil: when I set a size profil curve which doesn't strart from O.
Watercolor-deform-text: even with RAZ settings
No problem with pencil, special and custom brush.
EDIT: When using the keyboard shortcut "Space" (wich is default shortcut for tool:right mouse click) it works nice!
So I've assigned "Space" to a wacom pad button, but then it doesn't work (I've tried other shortcuts like alt and ctrl+alt on wacom pad they do work).