Currently a normal Switch Motor will respond to both a signal controller and redstone signals around it. It obviously will not respond to aspects if nothing has been connected to it, but there is no way to have it ignore interference from surrounding redstone signal sources even if you'd only want it to react to it's assigned signal controller.

I'd like a button in the gui that allows you to toggle it's ability to react to redstone on and off.

The only solution currently is to spread things out in an ugly manner to remove the sources of the interfering signals.