Just find a split screener and ask them nicely to back out on the last 2 seconds before game starts up.
Although, I will agree with you. It would be so nice if Treyarch would allow for a selection of 2, 3 or 4 player co-op selection. I also think you should have a check mark box that only links you to other people with microphones because seriously people you cannot play this game right without a mic..
Rank selection/preference would be nice as well but this would never happen!
hahahah that's too easy...right...