We had many times this request. We're really thinking about make a "surface fixture" / "master fixture" etc. but we'd like to invest the time & energy to make a clean - well designed and 100% reliable implemtation, and it's not in our timeline yet.
At the moment you have to create the controls manually (ie Quad 1 - opacity / red, green, blue, media type, media number). So it's working but requires more time to setup.
Thanks for the suggestion.