Comment 2 for bug 106383

You'd probably be better off using xsetwacom. It will set the buttons right and you can easily set rotation and other things after you used xrandr to rotate your display.

I just found out I can even right-click without even touching the tablet!

http://linuxwacom.sourceforge.net/index.php/howto/xsetwacom

xsetwacom set stylus Button1 1
xsetwacom set stylus Button2 3
xsetwacom set stylus Button3 2
xsetwacom set stylus Rotate CW

etc

give it a try