However, when I choose "edit" in the menu, to look at how these expressions might affect playback, they are always set to "none" What gives?

They don't affect playback either - or at least not without some sort of definition of what those expressions will be doing.
Even before I loaded that library though, the default library has pizz and arco in it, and those expressions trigger the appropriate KS samples - and yet their playback values are also set to "none."
Just a puzzling thing. I think it is awesome that you can trigger KeySwitches with an expression, rather than having to have an actual KS note in the score to trigger them. But how to create them, or assign them, that is a mystery.
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