I think a security feature would be a nice idea. Basically, make the "Power Off" option in the main menu become a menu itself. Have options for regular standby and then "Standby & Lock". This way, getting locked out on accident would be less likely. And of course, to get it to boot up you'd have to know the code, which you could set yourself using, say, emplode, or even somewhere else in the player software's menus. Just don't forget your code.