I think you should enable the lock code, then at least it won't fully unlock without enering a code as well.
system > settings > enable autolock
current code should be 12345

DONT LOOSE IT OR YOU WILL HAVE TO REFLASH


I checked mce.ini and it's only got the "power button" and "home button". I don't think it's the home button, but maybe it is? I wouldn't screw with that though!