The main reason for getting the Panasonic model over any other was to utilize the Viera Link whereby you can use the TV remote to control more advanced functions of the recorder.
I have the Panasonic TH-42PV700AZ TV
In actuality it's more hassle than it's worth when it comes to usability, and you have to have an HDMI 1.3 cable, which doesn't come with the recorder.
When you want to use a Viera link function,
The TV remote (the one on the bottom in the picture above) has the standard Video controls on it anyway (Power, Play, Pause, Stop, FFWD, RWD, Channel Up/Down, Record) and the DVDR control has the Power, AV, Channel Up/Down and Volume controls on it, so for every day viewing, the controls are largely interchangeable.
I broke my HDMI cable when moving house and I haven't got a round tuit to get a replacement so one of my main motivations has proven irrelevant.
One of the Logitech Harmony remotes would obviate the need for the HDAVI Control as well
There are quite a lot of search results for "hdavi control 4" - what are you expecting to find when you get to here?
If you post a response, maybe I can find it for you - thanks :)