I can configure my Wacom Pen button to be "tab" but when i use it the fast "palette" comes and change my color and mess things up. Like having tools > tab > colorpiker.
So Windows Vista Fliks don`t work either , only outside of Mypaint

I must reset the Wacom driver in second Portrait mode cause the pointer goes at the other side of the screeen.
Posivite things : Gimp-Painter-GPS > slow like hell on A4 , Mypaint > smoth and easy