I've experimented with trying to get various displacement maps I've made in the past in Zbrush and Photoshop to work in conjunction with subdivision via the Physical Surface Root. It works, but it's not practical compared to Firefly render time displacement. The comparitive amount, for the resolution maps I have at least, of subdivision I'd need to use is just too much. Just doing it via Firefly is way more practical with better results IMO. So Poser displacement is another thing that I feel Firefly does better at the moment. I use 11, I doubt much has changed in 12 regarding.