After a break I had one more try at it... I moved forward and this works for adjusting all the Properties on the light panel... except the vital one!

import poser
scene = poser.Scene()
if (scene):
      lights = scene.Lights()
      for light in lights:
        light.SetShadow(1)
        light.SetRayTraceShadows(0)
        light.SetShadowBiasMin(4.0)
        light.SetShadowBlurRadius(5)
        light.SetAmbientOcclusion(1)
        light.SetAmbientOcclusionStrength(0.5)

But the vital command seems to be missing... it should be something like light.SetShadowMapSize but I've tried every possible variant and also added Preview into the mix too, and it's error messages all the way.

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