I found this by accident today. I had never heard of some of these locks before. Master makes some interesting locks specifically for the disabled, or to meet the ADA (Americans with Disabilities Act). I thought some of these were pretty interesting, like the version of the famous 1500 combination lock that comes in only easy-to-remember combinations, or the push lock that is flared and comes with a large key for easy grip:
http://masterlocks.wordpress.com/catego ... lock-1525/