with LAN game, you mean the old school way? All the computers in one local network?
Launch the server on one computer and let any computer in the network connect to the computers LAN IP (most commonly starting with 192.168.x.x).
I have started working on such a mod, but with additional functionality (like guilds).
As it is quite an effort, anyone likes to team up with me?
Found it in the registry:
HKEY_CURRENT_USER\Software\Strange Loop Games\ECO
At least the resolution ;)