Mesh lights to cast higher ambient light would be a great addition. At the moment, I use point lights positioned within whatever prop it is that is giving off the ambient glow in order to boost the light without causing the prop to be blown-out by an overpowered ambient value in the materials. It works for the most part, but it is not, as I understand it, correct -- because Poser does not properly calculate squared attenuation in all instances.

As usual, if I'm wrong about that, correction is very welcome. 

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.