Is there a way to teach, persuade or force users to learn to use the Tab and Enter keys to navigate simple forms, instead of clicking the next field with the mouse? This is such a productivity-killer that I think a law should be passed.
The simplest example is a login form: 2 fields. I painfully watch everyone including experienced users click in the username field (even though the cursor was already blinking there), type their name, then grab the mouse, click in the password field, type, then grab the mouse and click the submit or login button... They never learn, and they log in to things dozens of times a day! It would be like watching a driver get out and push their car in to a parking space. Can we not disable the mouse and teach people to do what is far easier for them, faster, more error-free...?
To me, this is the single largest user-interface / usability issue.