Add option or documentation for how to make more like a touchpad

[AutoImport-rpglover64]

Without being able to see a direct mapping between tablet and screen, it seems like it would be useful to have the device behave more like a touchpad, that is, when it detects the pen, it starts moving the mouse, and when it loses the pen, it stops, and when it notices the pen in a different location, the mouse doesn’t jump.