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... (read more)