What would you do with a robotic third thumb?

I'd probably hurt myself more than I already do. It seems I always have some Knicks or cuts somewhere on my hands.

This is going to require further toilet training so no permanent damage is inflicted.

Amazing I was kind of hoping if biology would progress the point where we could just regrow organs and replace them without going in with surgery. But that seems to be a bit far off in the future. But this would be a cool hack.