Just a half-formed thought: in the following tweet, the developer has mapped foot pedals to some modifier keys, so she uses one pedal for alt-tabbing, one pedal for control, one for shift, etc. But notice how giddy and happy she is presenting that? My guess is that the fact that even a little bit more of our body is used in our day to day work, which is usually just the fingers and hands, would make us giddier and happier.
https://twitter.com/TaliaRinger/status/1485681422069346305