I misunderstood. I thought you said it previously shut down IMMEDIATELY after shutting down the DirecTV receiver. If it was a 30-minute no-signal shutdown, that's a horse of a different color.
Have you tried enabling HDMI-CEC in the TV and AVR? This might initiate a shutdown in the AVR when the TV is shutdown.
I've had very poor luck with HDMI-CEC... In our main viewing space (the one I've been trying to solve), it never seems to do anything... ie. I can enable HDMI-CEC on TV + AVR + WJ and nothing seems to turn on/off the other.
In our bonus room, turning off the TV *will* turn off the AVR.. but doesn't work for turning on... that;s the only place I ever see HDMI-CEC work.
I'm willing to blame Denon, and/or since each manuf has their own name for it, maybe they just don't inter-operate very well. And conversely when I turn the AVR on to listen to Pandora, I am just as happy that it doesn't turn the TV on
Given that, I was hoping to use the 30-minute power-save-off feature.. but that seems to get foiled by the always-on-video from the WJ (or so I assume). So rather than have it go hours or days being left on, I figure I can schedule a ~midnight cron job to telnet in and turn the Denon off (but I gotsta-go-learn-me some "expect" scripting it appears).