Currently the only locking dialogs that work with AppleTV are the numeric password and full-text password dialogs. Both of these provide minimal security since anyone observing the screen during password entry can discover the password. The gamepad button combo dialog solves this problem and is more secure, but it doesn't currently work with the AppleTV remote.
I'd like to add support for buttons on the Apple TV remote to the gamepad button combo (up/down/left/right/play).
What do you think?
See http://trac.xbmc.org/ticket/12733 for the patch.