Handykey's web site Thad prefers the Twiddler and has reached speeds of 50 wpm on it. Learning the alphabet takes 5 min. Thad says it was uncomfortable to use at first, but over a week of use you learn how to hold it properly for your size and shape of hand. The default key layout is more optimized for speed than is first expected.
Macro packages can be reloadable depending on the application.
It can run in both X and console mode. This key mapping makes the most commonly typed letters the easiest to reach. The original page . The BAT by Infogrip Their web site. Both the Chord Keypad and the DataEgg represent good solutions to one-handed keyboarding.