I wonder if we need to change our interface with the PC - the typewriter is so 19th century. Something like Kinect waving your hands to get stuff from your mind into the box. I reckon with shorthand encoding you could get 200WPM, and fit.
This is called "emacs fingers" in the office...
More seriously I do most of my work on paper with a pencil.
The thinking part being more important than sitting.