[Zubersoft]

You can do that with a touch action (Settings->Touch & Pedal Settings->Touch Actions, there is an action for enabling/disabling face gestures). If there is a reason you want a button instead of a touch action, let me know and we can discuss that. It didn't seem like the kind of thing that warranted a new smart button action though - a touch action makes more sense as it's a global toggle.

Mike