What do I want:
1) SHIFT+UP/DOWN to cycle action bars at all times, so I don't have to move the mouse cursor away from whatever I am focusing on in order to click on a tiny arrow to perform this action.
2) A hotkey for delaying a character's action in combat, so I don't have to move the mouse cursor away from whatever I am focusing on in order to click on a tiny button at the side of the screen to perform this action. Normally 'w' would be used for this, but as that is taken (for WASD scrolling), perhaps 't' instead.
Why do I want it:
Because it is a major UI improvement for minimal effort.
Multiple action bars and swapping between them is not something new and revolutionary. It is a well established design pattern, and when you do it for PC with a dual mouse/keyboard setup, you should - as a matter of course - make both selection from the active action bar and cycling the action bars be possible using either input device.
Given that this is basic UI design knowledge, I can only believe that it is something that was forgotten in the rush of so many other higher priority issues to address.
Incidentally, I also consider the tiny clickable up/down buttons much too small for frequently used buttons in a good mouse interface, but that's a different issue, as people who are primarily mouse-oriented in input method might find them large enough.
