I have one thing left to finalize with my configuration. I have a JVC DVD (XV-S500BK) for which I didn't find discrete Power on/off codes. So just for the record I sent JVC an inquiry on this. Here's their answer:
JVC America have no codes to give you to use on another manufacturer's remote control to operate a JVC product. Since another manufacturer made the remote they assign the code numbers that their remote will transmit. JVC has no way to determine what codes another manufacturer's remote has that might work a JVC.
I called JVC Canada, and the answer there was even worst. These people have no clue, but they won't even accept passing on the inquiry to someone who might know, like engineering maybe?
There, I vented some of my frustration!