I got it all working. I mapped the power code for the cable box to a different button and used that button in my macros. That enabled me to use the master power button for a shut down all macro and turn off the cable box when not in use (even if it makes no difference in power consumption).

I really appreciate all of your help 3FG, I didn't know about hifi-remote - super useful site. I also had no idea that these cheap remotes were so versatile, and the discrete power codes rock! Now I don't need to buy $100 Harmony remotes in order for my stoneage family to use the TV. Thanks again.