Muzzer is absolutely right - a wireless MPG is a real boon. My CNC router has no manual overrides but I use the MPG all the time for manual positioning - like the man says, you often want to get right up close to the tool for setting up and being able to tweak the MPG controls without even needing to look makes it all so easy. And no trailing cables catching on things and generally getting in the way.

Retaining manual control is so twentieth century...