Yo Adrian...
If I may make a few suggestions as well.
You need to lock down what you really need and why? You as the one being tasked to perform the design must know all the details of what is needed, such as number of rooms, remote interfaces, how is communication performed. Interfaces to the remote reciever. Before you can really pursue this to an end, a set of requirements must be determined. At this point, it seems as those we are spinning our wheels.
Do not think I am getting annoyed or anything, as I and most others here like to help. It's what we do, but my request to you is this. Nail down what you actually need, perhaps start with a system level diagram. Make sure you have the overall picture in your mind and on paper.
When you say to me that you are not sure how the remotes communicate I worry as it shows you do not yet have a good understanding of your own design. If you do not know, it is difficult to offer help.
Perhaps you should consider alternatives to your remote and look into wireless links designed for multi users. Or maybe even running wired multidrop serial comms.
What I am saying is that before we can help, you need a better idea of all the task and functions of your system. Take charge as Project Eng, set requirements, such as one switch for this, no that, etc.
Get what I am saying?