I read BW's rational for excluding multiplayer and mostly agreed. But we miss the human comptetion! Adding a tourmanent mode, a la Battlefront's Combat Mission, maybe an idea whose time has gone. This is the way it works in GalCiv:
1- Modder/Stardock creates scenario. Competing players download.
2- The Save option is disabled (in an update) and replaced by Send
3- After a session the player uploads his file to a hosted server. The file can be retrieved at any time.
4- On completion top scores are revealed.