* Whatever is slightly uninteresting is terribly difficult for him to focus on but if there's something interesting, he can maintain perfect focus for hours.
I don't think so. I think most people can do "slightly uninteresting" things, especially when they can see the benefit, and I think that many people have trouble focusing on things that they are interested in after a few hours.
I handle rote, monotonous work really well, as long as it lets my brain check out and think about other things. Alphabetizing by hand and transcription work drive some people mad, but I excelled at it.
Aren't we all like that?