> Quote - There is no "gamma" node, just the value in the image settings and in the render settings.

It is (only in 2010, and i guess in 2012, too) in the "Math" section (see illustration).

Quote -
Your shader will need a reflection node too if you work with IDL. Indirect light does not trigger specular nodes, you need low level reflection for that.

I think, IDL does not work with reflection neither, only diffuse (hence it is called IDL :-). Anyway, for the glitter effect any of those should work, but with specular you need some directed light (point/infinite/spot).