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I think they would have liked to give you this, and tried to give you this, but in practice it really isn't that simple.  At least not yet.

Well I know you know this, but it is most definitely not that simple.
If Poser 8's GI has any flaws in the available options it's that there are woefully too FEW options. I've never seen a program with radiosity that has only a few controlling options for it. The rule seems to be the more, the better.
I think the only way it will ever be simplified is if someone builds the telepathic render engine that just knows what you want, without you having to adjust anything at all. ;-)