Radiosity is good because it works like real light does, real light is a REFLECTION, so everything light hits, it gets coloured by
it comes through a window, hits a grene carpet, reflects on the red sofa but with a green tinge from the carpet

now, otudoors it does have an effect...sometimes. basiclaly if anything is close to the camera, or has a major effect on a scene (ie very big, or storng colour and lots of it) you want radiosity

so, indoors almost alway syou want radiosity if you want realism
outdoors, say a big ocean liner ship, it's painted white, you need radiosity to getsome ocean blue etc on it's white hull.

subsurface scattering is a pain in the BUTT to get right in Vue, far as I'm concerned it's largely trial and error with each object :/
tutorial on my site about it :)

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