I know of a way around it! In Poser 4: Copy the transmap and paste it on top of the texture in Photoshop, change the blend mode to "Multiply", flatten, and save as the texture map. Then make sure "Apply to highlight" is checked. In Poser 5: Assign the transmap also to the Highlight node. Gimme a sec to show you what I mean...

Remember, kids! Napalm is Nature's Toothpaste!