Well, as far as a wall switch, anything that will close a pair of contacts, up to and including a standard 110 wall switch (if it is not wired to a 110 circut), will do if you have a 2 conductor low voltage wire going from the switch location to the MSC.
Please, please don't take that to mean that you can hook a low voltage 2 conductor to a live wall switch!
Any contact closure that you can achieve can be sensed by the MSC and a macro triggered off of that.
Controlling the shades is easily done via the relays on the MSC.
The RadioRA is controllable if you have: a) Either of the RadioRa IR or 232 interface modules or b) An in-wall master keypad with an IR window and an emitter at the master keypad location - in which case you could trigger scenes from that master control via IR
So the short answer is yes it is completely possible if you have the wiring in place.
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