Touchscreen and Pen support?

[MeyerX]

I'd love to play on my Lenovo Miix tablet (2 in 1) during my daily commute. It does work with the keyboard attached to the screen. But the mini touchpad is not easy to use and I'd rather interact with the screen directly or via the Pen. While this does work for "left click", the "right click" on the Pen, via one if its buttons, is not recognized by the game.

Any ideas how to get this "right click" to work?