Hi Ben
I am a intermedate Zbrush user still learning. the only reason I said use zbrush uvs is one of the tutorials for displacement map said the uvs created after the disp map will take into accout the disp map. I need to look into this also as I will be doing some thing along those line with the Birdman WIP.
Maps created in zbrush can be used in maya and textured in photoshop..............dave