I was discussing possible things to add to Firefly with Stefan Werner on the phone a few months back. (You know who he is, right?) We were discussing more complex material capabilities, possibilities for the future. In that conversation, he told me that Firefly displacement is already vector based (3 values instead of just 1) and also that the existing transparency implementation is actually capable of using a color (3 values instead of 1). Neither of these abilities were exposed in the material room, but they are there.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)