Although most values are shown in your selected units, some values are always shown in Poser units (e.g. displacement bounds iirc?

Wrong. Some vales are consistently in mm (scatter depth), some in cm, grams, seconds or related (cloth and hair rooms), and anything related to bump/displacement is in the units you specified in Preferences. That's in the manual.

I find the inconsistency annoying, and I can never remember which ones.*

I'm with you. But the ones that change value when I alter my prefs, are the ones in my prefered units. I've sorted them all out :-(*

And I'm fairly sure that all values stored in Poser files are in Poser units

Wrong, material room is stored in inches, that's why Bagginsbill works in those. And the ones with stick with their own units and do not relate to your prefs, are stored just the way they come.

Sorry for this.*

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though