A small drawback of driving material properties with special magic dials is that as soon as a new material is loaded, those dials will just sit there useless because the parameters they were driving no longer exist. I think there's a chance to circumvent that by using well-designed materials plus a little bit of trickery, but I'll have to investigate. I'll probably put my material setup into the beta either way and see what people think.

-- I'm not mad at you, just Westphalian.