Let me qualify the Hair density issue. I havent given enough detail.

What poser does when you make hair is to "grow" its guide hairs on the corners (verts) of a selected poly. Which is fine and good. If you have a dense mesh then it grows a lot of guide hairs which should give you a lot of control.

The density control seems to be area based which is good as the density is affected  the surface area of the polys (of your selection). 

 

 

HOWEVER what poser does that is truly horrible is it actually renders its guide hairs!!!! no no no no no... do not do this. this automatically gives 4 hairs per poly irrispective of the desired density. 

 

 

Why? because if i want to make a sparse hair density on a surface the only way to do it would be to have 1 single poly for the entire surface and even if that were practically possible (which it totaly isnt) im still left with a hair in each corner!

The only way i can see to get down to just a single hair is to scale back all the guides except 1. This is hardly ideal as that hair is going to be on a vert and not in the poly. This makes softening the edge of a wig a bit of a pain particulally on a dense mesh. Im going to end up with a line of hairs on the verts following the loops in my topology.

 

 

Fix please! dont render the guides