Left Di2 buttons free on 1X setup. What to assign to?

Yip, Rain, Sweat or Snot. A drip can cause the touch screen to get activated and often repeatedly, changing datafields from what you are following (power/speed etc) to something completely different and in some cases it can send the unit haywire. With the 1030 if you touch the power button in ride, it’ll toggle between 'touchscreen locked/ un locked)