Disable all keyboard shortcuts -- text entry only in text areas. No tabbing between controls. Keyboard shortcuts considered harmful. Also, for the sake of comp

Disable all keyboard shortcuts -- text entry only in text areas. No tabbing between controls. Keyboard shortcuts considered harmful. Also, for the sake of completeness, randomize all on-screen forms to make it impossible to exploit a fake mouse. Muscle memory considered harmful. For added security, display an authorization code on the display every half an hour, and expect the user to do a XOR with a one-time pad, then enter it on the keyboard. Or morse-code it with the mouse.