I have a MacBook Pro, running 10.8.2 and I'm the only user (admin of course) with guest accounts disabled. In system preferences, I have the option of, requiring my password after sleep or screen saver begins, set to immediately. When I click the lock at the bottom to lock everything so it can't be changed, requiring my password doesn't get greyed-out. I find this to be a slight security flaw and was wondering, is there a way to make it greyed-out after locking my preferences, maybe through terminal? Thanks!