extra parts in Universal Hub?...

I just got my wheel put together and everything, but I'm a little curious about why there are extra parts in this kit. Specifically, there's two small bags that contain part W1 and S2, and I have no idea what those could be used for. Also, when not using a wheel, is it better to keep the collar retracted with the little plastic piece that came with the wheel? Or is it fine to just not use that little part anymore?

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