I have not had personal experience.
However, I do have a client who's nephew has ALS and she recently mentioned this computer program which can really help people who need an eye-gaze communication system if they have a severe neuromuscular impairment.
It has nothing to do with massage, but in the event it is helpful information for your client, I wanted to add it. My client says it has opened up a whole new world to her nephew:
May your trails be crooked, winding, lonesome, leading to the most amazing view. May your rivers flow without end, meandering through valleys tinkling with bells... http://www.lucasandlucasllc.com - Advanced Massage Therapy