Love that Harmony!
Having said that, I have the remote set-up pretty much the way I want it, to turn on the system I just scroll to select an activity and select it. Then to power down the system I select "Change Activity" and scroll down to "Power Off" and select it.
Maybe I'm missing something but what's the "Power" hard button for? It seems to have no fuction. Or did I make a mistake when I set up my configuration?