There really aren’t any options to configure the hardware buttons of the HTC HD2. It comes stock with only one additional action assigned to the long press of the End key, which will bring up a Quick List allowing you to choose one of four options: Power Off, Lock Device, Set Vibrate and Terminate Data Connection.

Leo Actionscreen is an application that will be hooked to the End key of the HD2 in the same manner, but this time, instead of the four options, it will bring up a screen with 12 action buttons to make your life easier with shortcuts to Email, SMS, MMS, Appointment, Task, Note, Contact, WiFi, Bluetooth, Camera, Soft Reset and Power Off.

Thanks for the tip, Lee!

(Source: XDA Developers)