Correct use of the keyboard is most important. If you are not typing correctly then your incorrect typing techniques can lead to and worsen RSI. Your wrists should be straight as shown below:
Various RSI sufferers have switched to the DVORAK keyboard layout as it relieves the hand action during typing. It may surprise you to learn that the common QWERTY keyboard layout was specifically designed to maximize hand movements and to be most inefficient. The reason being that older typewriters used to get jammed by touch-typists. Unfortunately this convention has continued into the information age.
Fortunately, in the 1920s and 30s two Doctors, Dr. August Dvorak and Dr. William Dealey, designed an alternative layout to minimize hand movements and improve efficiency
Dvorak and Dealey studied letter frequencies and the physiology of the hand and created the layout to adhere to these principles:
Dvorak typists tend to be much faster, both because of ease of typing (70% of keying is on the home row, vs 32% on Qwerty) and because of the reduced error rate on Dvorak due to its ergonomics, but the ease in learning and typing is its greatest advantage.
According to RSI sufferers, the DVORAK layout really does provide benefit as it reduces the overall typing action and evenly distributes the typing load to both hands. However, it is not a cure. Switching to DVORAK is another good way to aid in the recovery of RSI but must be supplemented with other forms of therapies.>