have you thought about using your single switch with an onscreen keyboard? I am not sure if OSX will let you automatically show an onscreen keyboard for the log

have you thought about using your single switch with an onscreen keyboard? I am not sure if OSX will let you automatically show an onscreen keyboard for the login screen (not sure why they wouldn't), but this would be as secure as you typing in the password via a real keyboard, and you wouldn't have to deal with all the other things that can go wrong. Also, have you tried to use a Quadjoy mouse http://www.quadjoy.com/ http://www.quadjoy.com/ this gives you full mouse use, and gets you out of jams when Dragon decides to stop working and your PCA isn't immediately available.