I was wondering if anyone has figured out how to further customize the surface pen. I love that I can assign different functions to back button however, at least for me, the default functions are kind of useless. I've already assigned one click to launch my web browser as I feel OneNote is kind of useless. Basically I'm trying to figure out a way to make double click open the touch keyboard (because it often doesn't open when I tap a text field and I hate having to tap the icon in the taskbar when working quickly) and change hold to function as windows + s (so I can quickly open search because even though I have Cortana disabled holding the button still defaults to Cortana and not a regular search field). I'm not sure either is even possible without a third party program. I'd also be interested in hearing what other people have set the button to do.