Ah, yes, I see. I can see how a button might be useful for that.
However there is a workaround of sorts. Just keep it on, bind a head-look reset button and bind a mode switch button, before binding the head movement to the POV hat. You can do it so the POV hat can have some functions (like a power management) and only when you hold the mode switch, it will move your head around. Then you can just reset to facing forward and release the mode switch, so you don't accidentally move your head while doing other things.