This is a pretty high tech question, but how would I go on with adding something like this, is it even possible to do with the CK and some hlsl (i'm supposing) shader coding?
http://www.youtube.com/watch?v=HSjU2oUl5_0

Cheers!

The CK won't help you here - You'll have to go about the 'old' way (disassemble the shader packages, modify the shaders, recompile and repackage them). On a slightly related note, take a look at http://www.creationkit.com/ImageSpace. I believe they can be used to apply certain kinds of post-processing effects.

Right.

I suppose that workflow was invented for Oblivion. Unfortunately SSS is not a post processing effect :/ so imagespaces won't help but that is really nice to know ^^ thanks.

Can an entierly new shader be added / used by a mod through disassemblying and recompiling the shader package?

Thanks for the quick response ^^

I think it would also have to be enabled in a models material properties.

Right. But I still have no idea if I can add a new custom shader to that decompiled file and then recompile and get it working.
Suppose I can do some research, google my friend.

Thanks ^^

Yeah, I realize that You ought to be able to replace an existing fragment with a custom one (provided the new one works on the vanilla's input parameters), but that's about.