Poser is NOT limited to 4096x4096 maps.
And that is 16 million micro poly's to work with..... on top of the polys already in the object to give the basic shape.

 

Vilters,

 

What are the new limitations? I have done a displacement map @ 8126x8126. This was for V4s 3 4096maps plus 4 smaller maps for eyes, lashes,trans etc.