Yes, a real low poly count mesh might distort the texture. Not many objects made for Poser can handle to be subdivided. Because they were not meant to be subdivided. Right now I'm working on a house in Modo. Some walls are not welded to keep the poly count down. No reason for 10 lops running through 10 walls when you only need it for 1 wall. And who will subdivide a house :)

I don't know if Poser support multiple UVs on the same mesh. I haven't tried it.