first, power button support is merged into github, but not in any release. {i can build a deb for you off of master if you like}

second, the biggest missing component in n9bm is the ability to cancel the button's default action. no one has any idea how to do this. this makes n9bm useless except in standby, and in apps that override the volume keys.

SO, technically, yes, but it probably wont work because the screen will unlock first and thus you will no longer be on lowpower screen.

however, double-clicking power should work, from any screen, and may even be useful.