I do see that separate shoe figures are easier for the creator. My point is that a single figure with two shoes is easier for the customer. If you want your girl to be wearing only one shoe, you can make the other one invisible within the single CR2. The fewer CR2's in the scene, the happier Poser will be, in my experience.

I'm making a case from the buyer's point of view, you for the content creators. The content creators want MY money to become THEIR money, so they should at least consider my point.