I think for enterprize users - the ability to add firewalls and routers as a specific device and have them come up as a "tab" like servers do would be a great feature.

i currently use the "external tools" -> telnet to connect but this opens the connection in a sperate window obviously...

Actually we had similar idea in mind when asked our user about upnp feature: http://www.s-code.com/forum/shwmessage.aspx?forumid=3&messageid=188
But seems there are not much of interest for such feature. But anyway having a built-in telnet and ssh client is on our "features to implment" list.