I agree with ya on this one, as me and buddy use it also. Conferences r really nice, and usually the file sends fairly quick. However i am all for TCP/IP over, having to do this.
Personally, without a full chat/voice engine capable of handling 5 players at once, it's a waste of space. Use what is already out there and fully functional instead of having someone reinvent the world everytime a game comes out. You'll also need some kind of turn timer that forces they player to make a move in x minutes or has the AI take over the turn etc ... Speed WaW ... pointless without it really. Couple with some ability to handle people dropping their connection so your game is not ruined, ability to flip back and forth between pbem/liveplay, firewall handling, etc. Add a couple extra player slots too, might want someone else to be able to *watch*, or have team play, etc.
All sorts of things need to be thought through properly. Not a simple request when you *actually* give it some thought.