As a long-time Wacom user I expected the SP3's pen buttons to work at least a little like the way they work on every other device that comes with an active stylus.
I realise the digitiser in the SP3 is N-Trig, not Wacom, but it still has the same buttons as a Bamboo or Intuos stylus, and they're effectively unavailable for general use.
Right-click should be able to work while the pen is hovering, and the other button should be middle-click (also while hovering) by default or able to be set to return a double-click.
Without being able to right-click normally or middle-click at all, many applications are hobbled or rendered unusable - and those buttons on the pen barrel are just sitting there, teasing at the SP3's untapped potential.
Is there an update for the pen functionality planned? Is there a third-party way to remap the pen's buttons for right-click and middle-click? Is there an alternative device driver for the pen? Is the user community going to have to write a replacement driver? I'm prepared to do it myself if I have to, but we really shouldn't have to.