Make companions layer the same way as accessories.

I like to arrange my scenes in a certain way, and often I find my choice of companions severely limited because of this. For example, I currently have a cobra and a set of eagle wings on one of my dogs. The cobra looks as though it's growing out of the wings at one point, and I think it would look so much better if I could simply layer the cobra behind the wings, the way I could do if it was an accessory.