Yes, Scale is the value you change. I know why they called it Scale but it's dumb. The right parameter name for it would be Attenuation Multiplier. For each preset (chicken, ketchup, etc.) the implementation of the attenuation was created by the programmer against an arbitrary dimension of object. Because Poser doesn't even agree with itself as to what an inch is, we have the need to tweak this "nominal" attenuation. That's what Scale does.

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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)