I'm another person who would really like to be able to choose how to furnish that room--it would be nice even to be able to pick up those beds the same way that we can pick up and move tables, the fireplace (seriously??), the TV, etc. I will probably do children at some point for the Steam achievement. And maybe for the hats. But I would really like to be able to move their beds out of the way if I'm not going to have kids.
Maybe adding in a "furniture storage closet" with that house expansion that could only hold furniture items, and that would come with the kid beds?