I have come to the point where I prefer using DAZ|Studio over Poser6, but Studio not having Ambient Occlussion was killing me, until I found the ahEnvironment light set on DAZ.  I suppose it is a plug in, but what it does is a lot more than I expected.  It includes complete new lights for DAZ, and keeps the original ones,  each of the new ones has extended options and parameters, for example shadow color on an ahSpotlight.  But it also has an IBL light.  and a new one on me: an ILT light.  The only hitch so far, is using an image on the IBL light, requires moving the light itself around to  unexpected positions to match the highlights for the render, i.e. the highlights from the ibl come from a different direction than the light is pointing...bottom line I got the AO I wanted and a ton of other exciting rendertoys in the package.

here is a before and after

(This is a laboratory file I made in DAZ to directly compare different shader settings, in this case specular strength and specular glossiness.  all the spheres have the same settings except for those two.  the values from bottom left to top left and bottom right are 0%, 25%, 50%, 75%, 100%)

full size view: http://artzone.daz3d.com/azfiles/gallery/bc/i1/89925f5ehkbv75ja0dyi4oomj5onur-full.jpg