Cause setting button functions for camera button or power button seems like similar tasks to me. So why not group stuff like this up. Also camera button had uses set to it already, those are just enable for larger/different kind of use. I still don't understand what the difference is between assigning tasks for the two buttons. It would be the same thing if you assigned actions for the backspace key for example? I'd have this button also inside the application that lets you define what each button does.