The need to do something, anything even if it is a mindless thing is referred to as punding. Parkinson seems to generate this need in many of its participants. It is generally harmless until it gets in the way of other things. Here is more from the Davis Phinney Foundation website.
Cheryl does this at different times. It used to drive me crazy and sometimes it still does if she starts up immediately before we are going somewhere. She often does it in the car with the purse of many pockets.