Daniel -
I don't want to turn everything on at once, but I do want to turn more than one device on. It just seems logical to be able to do that with a hard button labeled POWER.

Here's what I would like to do with a POWER button macro: Turn on my receiver, TV, switch receiver input to "Satellite Receiver" and go to the first page of that device. I currently do this with a power button on my MAIN page, but it would be more convenient to be able to do this with the POWER hard button, since I wouldn't have to activate the touchscreen (and backlight at night) to do so. Each other device in my system is powered up and goes to its 1st page through other MAIN page macros.

With respect to the MX-500, I suspect you will need to use one of the M1,2,3 keys to power up more than one device at a time. However, the button labeled "System Off" is intriguing. I guess we'll have to wait and see.