I've never understood this. In over 30 years in the industry, I've not once held a job where my keyboard speed had a noticeable effect on my productivity. Even when I had to type one-handed for a month, my productivity was unchanged.
The average developer averages 10 lines of finished code per day. And even with a raw 10x that amount to account for variance, changes, debugging etc, you'd be at 12 lines PER HOUR. Being generous at a full 80 chars per line, you have a maximum of 1000 keypresses per hour, or an average of one every 3 seconds. Even doubling your typing speed or keyboard response time would have no discernible effect.
90% of software development happens in the mind. The small amount of time spent actually writing it out seems kinda silly to optimize for.