Looks interesting!
When I took a networking class at uni, a significant time was spent in the router's shell doing things like messing with vlans, dhcp, etc. So unless I missed it an advanced tab would be great
On a personal note, what I think would be cool is replicating a production environment as a default, i.e. have an ISP which hosts a DNS resolver (which is always out of date :)) ), drag & drop some wiresharks on specific wires to see the traffic through that wire, a STUN server/IP:port echoer to show hole punching, mess with Route tables and see a TTL go down and the packet get dropped, etc.
