Just me again!

So, I have following problem:
-50 discs
-using different, but algorithmically generated texture
-lit by one spotlight
-have to throw shadows onto themselves
-but should not throw shadows into the other scenery
-don't use lightgroups (they're buggy in the betas at the moment)

Any ideas?
To give you an idea what its about: I'm using textured discs as
slices through a cloud-scape. Thus, the slices have to throw
shadows onto themselves. But, when using the area-light
(only in this scene, in others, that'll probably be different),
they don't throw shadows on anything else, because the
shadows are blurred away.
Now, I could save tracing time (a lot!) if those shadows were
only calculated for the discs, not anything else.
But, as mentioned above, lightgroups are a little buggy and
difficult to implement into the existing scene.

Ideas, anyone?

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html

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