I work on ship's where it is common for one or two of the officers and crew to have thumbs and fingers missing from 'accidents' at work. How are these guys going to cope? I bet everyone of you knows someone with a digit missing, that's quite a lot of people that won't buy this concept, unless there is room for customising.
Most of the guys I have known with missing fingers weren't too big on computers. I think something happens when you lose a finger you immediately just start drinking Jack Daniels and being angry.