How about a special master device which all the slaves can pair to under certain conditions, would allow the user to configure one slave node at a time with their settings, change the node behavior..?
Could be a touch screen based device, sitting on a special frequency, waiting for slaves to come online to pair with. Once paired, with a few screen taps, the node can be set a NET ID, NODE ID, anything else, and unpaired from the master to start transmitting on its regular frequency.