User Level Shaders in TGE?

Hi my query is about support for external shaders in TGE... I am not talking about DX or CG low level shaders...but something say an artist can use for different effects...for example: a Predator Shader that displays everything as a thermal image...or a matrox shader that adds a dull dark greenish tint...

Is there anything in TGE ike this currently...??? if not is any one working on these...???

any ideas as to how to do this???