I haven't done this for a long long time, not since before Opposing fronts. But when I was playing against my friend I used to put a sniper and an mg in a building. It was absolutely devastating for a while. If he tried sniping me he'd get one of the mg guys and then my sniper would shoot his. This worked really well until he figured out some way of targeting the sniper in the building first.
I asked him how he did it but he wouldn't divulge his secret. Was he just lucky or is there a trick to selecting which unit you snipe inside a building?
I have a friend who is just starting to play, so we'll be doing some team auto matches. He only has the old vanilla, and I thought this might be a good easy to manage little strategy that he won't have to babysit the whole time. But if you can select the sniper in the building it doesn't really help.
Can it be done?