I don't have the wireless, but I will in a few weeks... so, for today, this makes me an expert
I believe that wireless can only go one
way. That is, you configure the wireless to be a transmitter or a
receiver, and sound/ML commands can only go from the transmitter to the
receiver (and not the other direction). Therefore, the best you will be able to do is to get sound from your video room to your audio room or from your audio room to video room, but not both (maybe if you bought another pair and set them up in the reverse direction?).
Since you can get sound in the audio room, I suppose this means your video room is transmitting and your audio room is receiving. This is why you cannot get CD or radio in your video room.
There is a nice compatibility list found here:
http://forum.beoworld.org/blogs/coolskin/archive/2008/02/24/Beolink-Wireless-2-compatibility-list.aspx
However, it doesn't have the BS5 listed. It does say that Beoport is not supported, and, in many ways, the BS5 is similar to the Beoport so maybe that is the problem. It does say that the BS9000 is supported as a receiver, but it's not clear to me what this actually means - I guess it means you can get "Sat -radio" from your video room.
Finally, if you have the cable and it works, why use wireless?
Stan