The P5 renderer is really wonderful, and hardly discovered yet. I've been playing with the alternate diffuse slot and probelight feature to experiment with "faking" a GI look by softening the darkened diffuse area. It's nothing like having REAL global illumination at your disposal, but it's amazing how close you could come in simulating the look using just one or two poser lights in the scene. You don't even have to use any lights at all with probelight actually, as Stewer pointed out in one of his threads a while ago..