My recommendation is for the OK and cancel buttons on the security pop up window to accept hitting enter. I was trying to install mouse drivers and was getting a security prompt. I could tab through options to ok/allow button, but pressing enter did nothing. Had to totally turn down security settings to get it installed.
+1
Yes, things should be navigable with the keyboard.
+10 :-TU
Everything should be navigable with keyboards, mouse, and hotkeys.