Nope. I did it in Pro Pack, a few months before Poser 5 was released. Basically, I rendered the animation twice: once with human textures, and once with wolfy textures. Then I loaded both animations into a video editing application and performed a dissolve transition from one to the other. You're right, though. I can now do it all in one take with Poser 5, using the Blender node to change textures.