When wiring a bedroom, kitchen or hallway, there is the need for a micro-switch on the wardrobe, pantry and hall closet doors. To turn a light on in those areas currently I would need to use a bus-coupler. This can involve running cables from either end of the house or even from other floors to the bus coupler. I am making the assumption that most of the single and double switches use the same controller as the multiple switches, but with nothing on those particular inputs. What I would suggest is turning at least one of the spare inputs on the single or double switch into a single bus coupler! This would make the run a lot shorter and could also open up new possibilities for inventive minds to use as control. If you see this as opening a can of worms maybe you could come up with a micro-switch specifically matched to the switch unit for this type of application. Colin Smith