Yeah, that's what I'm refering to.  Using P5 (6 or 7) with the P4 render engine selected, but don't use "ignore shader trees".

The P4 engine will actually use a number of shaders in the material room.  I'm not sure which ones it ignores for sure, but I know that (obviously) anything with Raytracing will be ignored.

Anyway, if you use Face_off's Real Skin Shader (and probably the HyperReal, which I think is basically the same thing) with the P4 render engine you will still get very nice results.

I must point out that I have not done this with P6 or 7's P4 engine, only P5's.  I don't know if they have done any changes since.  I'll post a comparison shortly.