What does SDS stand for? I’ve been seeing it a lot when caustics are mentioned.
Specular-Diffuse-Specular paths 
Here you have some info:
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mark objects as caustics casters, caustics receivers and caustic bouncers
This is what the recent MNEE blender branch does. Though that branch is only for resolving refraction caustics. SMS’s more advanced.
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Yes, MNEE only causes to explore manifold in the shadow of a refractive surface. Unfortunately, we didn’t get far with SMS cause there is just so many things that I have to take care of. I hope someone will leverage MNEE to the main and also upgrade it to SMS in the future