If an existing layered texture uses filter, it will look the same using
transmit. The conversion is not that hard, and I personally would like
to be able to have filtering layers.
This is a problem with the language, if I tell it to use filter, it uses
transmit. It should do what I tell it, or at least issue a warning that
it can't.

Maybe instead of changing the behavior, we should make a new way of
specifying transparency. Keep the existing method the way it is, but add
a transparence {} to the pigment statement.
transparence {
    additive AMOUNT
    multiplicative AMOUNT
    function {blah()}//an isosurface patch type function
}
This would keep compatibility with current scenes, but make it much more
flexible.

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