Implement TPCButton option for Wacom tablet PCs
TPCButton is the option provided by the wacom driver to modify the behaviour of the stylus buttons. When enabled, stylus buttons act as a modifier for the tip.
- hold the stylus button down
- tap the screen with the tip
This feature is enabled by default for a number of tablet PCs hardcoded into the wacom driver, but the last entry to this list was in 2014. This would obviously be a device quirk, but whether it's necessary is a completely different question...