i would say so... as you can read here... http://download.autodesk.com/global/docs/mudbox2014ext/en_us/index.html?url=files/Whats_New_2014_Extension.htm,topicNumber=d30e507
Looks like a solid start. You definitely need to get some kind of Global Illumination, Sky Light, or Environment Color into the mix. What are you working in?
Really cool design and nice shaders as well. IMO, your Global illumination needs some tweaking to get a better overall lighting and a bit more brightness.
Now I'm confused, because you talk about applying an effect in the roughness globally, and then you tell me that the opacity is not working ? What is the real problem exactly ?