This feature isn't complete, hence no docs yet...
Suffice it to say that creating a driver with the correct type of fingerprint will indeed cause matching devices to display under LAN Devices.
We're just not ready to disclose the details of this interface at this time since the mDNS side of it was causing some excessive multicast traffic...
We're expecting to get back to this implementation, but it's not likely to be available in 2.1.3.