Are you sure he limits it to his foot skin?
Play your cards right and you could put him to work like one of those fish that eat dead skin off feet as part of a pedicure.
Apropos of nothing, does Stallman still request access to a parrot? It'd be funny to find him a place to stay with a person whose parrot is trained to talk shit about Stallman. "KWOK! SHUT UP ABOUT HURD!"
Frankly I'd be more impressed if they had a lab of non-thermodynamic devices.