Customising the hardware keys of the HTC HD2 can be limited, apart from the Endkey button, which with a long press brings up the Action Screen. The stock action screen only brings up a small number of options, but with this mod, XDA forum member johcos furnishes your Windows Mobile device with far more.
johcos has released previous endkey mods, but this one is of a sleek, elegant design more in line with the streamlined handsomeness of the HD2 and with many more options.
The Endkey mod is available in English and Greek, although johcos has posted that he is happy to translate the mod to other languages as long as the translation is provided to him in a post.
To download the cab file, check out the forum thread.