There is also software that can help with visual tracking when reading, including the tools developed by my startup. [1] We were actually unaware of the benefits our tools would have for stroke survivors until we heard from them.
Its possible to have had a stroke and not experience any long term effects.
Dasher is designed for text input with limited movement. You can try it out online: http://www.inference.org.uk/dasher/
Many of my users have motor control issues. Depending on the manner of the difficulty, I think this will be useful to you.