I have two hubs in two locations. At each location, one hub does Zwave and the other Zigbee. Several times I have accidentally been connected to one of the hubs when I wanted the other, and can't figure out why I can't add a device. It's because the device is Zwave and I am on the Zigbee hub, or vice versa. Would it be possible to gray out and disable the radio that is turned off in the Add Device area? I know it is a stoopid request, but I have spent several minutes (or more) troubleshooting this.
Perhaps it would be good to provide an indication of not only when the radio has intentionally been turned off, as is your situation, but also if the radio has been turned off due to high load on the hub (or any other reason).