I would be very happy with a transmission color, consulted for shadow calculations. I could easily fake the caustics well enough using Edge_Blend alone. This would neatly solve the problem of avoiding unwanted shadows from glass.

I got around it here by simply reducing my main light shadow strength. But I could only do that for this isolated prop. In a general scene that would be a fail.

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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)