When I saw this change in the beta builds of Mavericks I submitted a bug report since the ability to change the power button's behavior was also removed from `pmset`. They responded with a "this was intentional." This is the biggest thing that angers me about the way Apple handles software changes. This could have been switched as the default, but having to go to this much trouble to change it back to the functionality the button has had for years is just ridiculous.