How do I soften up blocky radiosity shadows?
Is gourad shading on?
I never heard of that, or seen that button.
Yafray will render much better looking radiosity than Blender’s internal radiosity. They use two completely different techniques and Yafray’s is the more modern/advanced way to do radiosity.
You might want to check out: http://wiki.yafray.org/bin/view.pl/UserDoc/GauravGuide