Hm, not sure if I remember this wrong, but wasn't UNLIT just setting an entities' material to mtl_unlit if set in WED and basically do nothing regarding dynamic lights otherwise?
You could try setting it's materials Diffuse-parameters to zero, but I'm not sure if this will also stop the calculations from taking place (or if its all calculated only to be thrown away by multiplying with zero later).
Though I have no experience at all with Shade-C, so maybe all of this is wrong and useless.
Perhaps this post will get me points for originality at least.
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