I agree about the post battle viewer. I have been told that we'll be able to see if any surviving enemy ships where damaged so I won't wish for that again.
As for fighting tactical combats in MP, it could be done if a LAN play option was added. You actually connect to other games running on other computers in a LAN and play. Sim turns would probably work best but I know some people would want turnbased as well. As soon as combat occurs the players involved are taken to tactical mode an dukes it out. During game setup there could be options like, nonfighting players watch, only allow tactic combat between humans, always allow tactic combat or never allow tactic combat.
This would of course mean massive coding of network code so I really don't think it will happen. I don't really know if I want it to happen either. I'm just saying it could be done.