I have used the dude for a couple of years now and love it, its simple to use and very reliable.
It provides me with a great overview of my network quickly and accurately.
In simple, the dude is a great bit of software but i have just found another network map tool which promises to be HUGE!http://www.spicework...ceworks-network-map/
Its currently in beta but promises to do what you want, they have even put a feedback button in which they say they will read all requests.
Its free so why not check it out, you havn't got anything to lose :-)
There is a huge support team of voluenteers and staff on the Spiceworks community ready to help you with all questions.