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I experienced that dynamic (stencil shadows) do not work on shaders.
This shoudn't be the case, as shaders materials have little to with the stencil shadowing system, unless you purposefully disable or mess with the stencil buffer in your material.
Either way your request is redundant, as this has been asked for many times, and JCL has repeatadly stated that such things are eventully planned. I just wouldnt expect them any time soon. Use Sphere instead 
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