Under that key there are strings that read:
APP1_Path, APP2_Path etc...
Change the shortcut these point to to change the aplication that is launched when pressed.
APP1: Messaging Button
APP2: Media Button
APP3: Internet Button
APP4: Calendar Button
APP5: Contacts Button
APP6: ????? (There is a key here with nothing defined...dont know which button it refers to)
Now for more poking around. Still love the Q9h!