Is there a way to see a list of new devices that The Dude discovers?

THe HISTORY ACTION pane has only vague entries like "Service Changed" and "Network Map Element Changed"

The DEVICES pane shows all devices but it would be so nice to see a 'first discovered date' or 'last heard from date' or some other way of finding recently discovered devices.

[Ideally, with the option of sending a notification of some sort whenever new devices are discovered.]

Any solutions?