AR5 cannot map directly to any buttons or switches of a Wacom tablet or Pen.
As you know you can map every button or switch of a Wacom tablet or Pen to various functions, clicks, and keys (the tablet emulates these)
So you can
1. map the Wacom buttons and switches to keys (or some limited combinations)
2. map keyboard short cuts in Ar5 to the same keys you had set for the Wacom tablet