I agree that it should be in the Play Now... If the play now button were like the Civ3 button where it just took you straight to a game then it'd be different, but if I'm going to set up everything else about the game, I might as well put in how many people I'm going to play against, however, I guess that's the main difference to the custom game, so whatever, personally I don't care since the Custom Game has it, but it did kinda seem strange to not put it in the other option