I've only used the unbiased modes of Kerkythea once or twice. It's just too slow on my ancient hardware.  I was curious though so I loaded an old .pz3 and hit render - and waited...  I didn't notice the shadow on the backdrop until it was done, but after  hours rendering (in MLT mode), I wasn't about to redo it. I'll stick to Vue. The LuxPose plugin mentioned looks very promising. If Lux delivers on their GPU accelerated rendering, speeds may actually become tolerable.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken