"Any Network render for Poser, because of the hobbyists, would have to be able to execute multi-cpu rendering same frame, to avoid howls of protest. That HAS to be a whole ball of wax beyond 'you do this frame, you do this frame and you do this frame.'" That's true, however it's not really a big thing. In 3dsmax scanline rendering, for example, the task of network rendering is split up frame-by-frame (as you indicated), with each rendering server working on a single frame at a time. However, mental ray's 'Distributed' rendering can efficiently distribute the rendering calculations for a single image or frame to several machines. Using multiple computers over a network, the rendering of a single image is split up socket-by-socket, with each rendering computer working on a single socket at a time. I think Bryce has this kind of function for still images as well with it's "Lightning" addon, and I'm sure most applications do, so I don't think this would be an issue as to why they haven't integrated it yet.

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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.