If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Personally, I estimate the value of learning to type faster at approximately zero, because I can type faster (about 70 WPM) than I can decide what I want to type. How much time do you spend wishing you were able to type faster, because your fingers aren't keeping up with your brain?
It's less a question of average composition (deciding what to write) speed, and more a question of how much I'm keeping in memory. With a slower typing speed, I have to keep more in memory about how I want to finish the thoughts I'm having, and have more difficulty and frustration involved in the process.
In other words, composition isn't a marathon, but a series of sprints. Each sprint is a race to get the thoughts you have out of short term memory and into storage. You'd probaply find your composition speed increase with your typing speed, as you can focu...