MENU > CAMERA••••• (C.Fn) > C.Fn IV: Operation/Others > SET > 1: Custom Controls > SET > turn rear dial to highlight the SET button > SET > turn rear dial to select the [ Q ] (Quick Control Screen icon) > SET.
Now when you tap SET, it wakes up a control screen on the rear LCD from which we can control everything with the dial, joystick and SET button.
Once you get this screen, use the thumb button to drive around, and the dial to change the setting. If you need more details about what you're setting, press the SET button again, but it's not necessary.
There's no need to press OK or DONE or EXIT. The instant you've changed something, it's done."
I use a screen like that on my 6D a lot, accessible from the "Q" button. So I figured someone must have worked it out for the 7D.