If I play a Spring game I start it in window mode and switch to fullscreen with my window manager, KDE4: Alt+F3 and select fullscreen. An external lobby is kinda nice but it shouldn't look and feel like the Spring-engine lobbies. They look like applications not games with a chat system. I developed a bit for a few of them besides using them. The network protocol is old school, unencrypted text stream like: "LOGIN NAME PASSWORD....\n" Not secure and easy to extend but simple to implement. For external lobby looking at supreme commander or steam is much better. I also commented on the game lobby for 0AD in IRC. I think it should contain features like chat, clan and matchmaking with a score/statistic system. I would be willing to help developing a lobby server.