Mental Ray is great, no doubt, but the problem with MR is that it's quite expensive to license compared to Vray or some of the others. I think the MAIN problem with finding a company like this willing to license their product to Poser is going to be support. They aren't going to want the hassle of supporting a community that's very new, by enlarge, to this kind of high end rendering. Obviously, if people are having a hard time rendering with the simple Firefly interface, something comparitively complex like MentalRay, or even the Vray stadalone, is going to be extremely overwhelming at first. 99% of Poser users will not care to tackle the steep learning curve, sorry to say.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.