> Thirdly (and I am sure that this has already been suggested), allowing 
> jitter of reflected and refracted rays would very easily implement blurred 
> reflections and refractions, making some nice effects available

MCPov allows you to do exactly that, using a simple "mc_reflect" keyword in 
the finish block.  It takes parameters for the number of rays to spawn and 
the "burriness" of the reflection:

http://pagesperso-orange.fr/fidos/MCPov/samples/sample_05.jpg

Personally I think MCPov style ray spawning should be included in the core 
POV, I guess the only tricky bit is figuring out a decent SDL syntax that is 
easy to use, but also allows enough flexibility.

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