My wife is a physical therapist and used to work with disabled people with very limited mobility that have to use a power wheelchair to get around. Some can't even control the joystick with their hand, but use other means (chin, tongue, head, breath, etc.) to control it. It’s really awesome how technologies, particular computer software, have helped to improve their lives.
If you find it difficult to type, perhaps look into a speech recognition software to help you. It’s very accurate in its speech recognition.