you'll have to do the randomization, Im doing this with amapi and after the intial setup, its easy to get just a tad of randomization with it by just stretching the mesh it can even be randomized a bit by using zbrush and squishing the mesh around a bit in there. actually, Im considering making some pre-fab meshes that are properly mapped and setup...along with shaping morphs so anyone can make their own stuff. it is still not possible to make a 'calico' because you need two different mappings for the same obj and thats not possible with poser (to my knowledge) :)