Mike, if you are working on the Windows version, adding support for the pen eraser, and an option of its button changing to eraser (or optionally another tool) would be useful. Perhaps with a few of us having Surfaci [sic] 
you could create a Windows forum so we can start ideas. Maybe even an Android emulation sub-forum?
you could create a Windows forum so we can start ideas. Maybe even an Android emulation sub-forum?