@dave2590 hey there, I'd like to have a 'shutdown' option too. I got an rpi3 with some standard rpi case (reddish) without any buttons. Also I'd like to shut the system down by controller.
Rebooting and finding the right time slot to remove the power plug isn't optimal.
I'd be happy to do some tinkering or maybe even implement an option so this can be an option in the menu. Users might select either to shutdown or reboot. Anyone else looking for 'shutdown'?