This would be great. However, does the digitizer still run even when the screen is powered off?

I assume face-down or shaking would be hang up/reject call. Double-tap while locked would obviously be to either wake the device up and enter the lock screen or to unlock the device to the running app/hildon-desktop.

You know what would be cool? If we put our finger over the proximity sensor while locked, and entered voice commands "call home" "update apt catalogs" "get gps fix" "get system temperature" and the like. We'd instantly bring the N900 straight into 2012.

NOTE: I do not know how to write code. I simply discuss on the forum, and occasionally make UI mockups.