some of these have already been said, but these are all great ideas
1.able to watch a game in progress (and talk to them)
2.team gameplay mode, as in allies
3.troop sharing, although this would only work if team gameplay was avalible
4.tournements would be great, winning prize would be like a map pack, 1month subscription, avatar race
5.exta xp for comebacks, bad starting time(last to pick starting point), game mode
6.scoreboard, full ranking table listing top 500 or so
7.power-up spots such as, extra troops, more time, 1 free take over... power-ups would become avalible on blank areas after the first turn
8.being able to kick a player(talking too much) after they are already out, same would go for out side viewers if number 1^ was added.