I played with SunFlow GI settings today, just as it was shown in the thread you've quoted and it's way too heavy and with ugly results. Then I took blender and yafaray and with manual in hand and yafaray forum I managed to get satisfactory results.

Below is a 56 second rendering in Yafaray 0.1.1+Blender 2.49b, Pentium IV 3.4 GHz, 2GB RAM, (all compiled under gentoo with SSE2 optimizations)



Even with the noise present (which is a matter of tweaking rendering params) IMO it beats SunFlow by several headlengths. Now I'm even more convinced it's a thing to look at as a nice feature for SH3D.

Best regards,

Wojciech