dave, they make coordinating devices of every type including mechanical single pole and 3-ways. as for the 3-ways; every digital 3-way i've ever seen needs a master and slave, so its nothing to fault leviton for. its a system that needs to be planned for to avoid the situation you mentioned above. if not, you can always old-work in what you need.
Are you saying they make "coordinating" dimmers that will look like the Digital Vizio but really aren't? Are you sure about that?