It would be freaking awesome if there was a coop game that could be played, with someone on another computer. Everyone would have their own point base, and their own squad. Infantry limit would be split 50/50, and you would only be able to control your own soldiers.
You could make it so every other wave the 1st player would get a tactical point, while the 2nd player would get tactical points in between the times that the 1st player had.
I have know idea if this is possible, but if it is, it would be a great addition to the game.