I have more than one subnet/vlan. Is there a way to expand what address range the thing scanner scans?
What Binding are you referring to?
Honestly I figured it would be a system wide setting that would determine the scope of ip addresses that were being scanned, though if we wanted to focus on one I would say the TP-Link binding would be good one to start with.
No, Bindings implement their own discovery service if devices can be discovered, either as MDNS or UPnP discovery.
There is no general Ping discovery.