IIRC, the choices were there, but it didn't seem to have any effect.
Well, crap. You're right - Last night, I test-drove my LJ for the first time after making those changes, and no matter what settings I set with the DRBIII, the speedometer reading remains un-changed! There was nothing I could do to get the changes to "take"...
I'm going to have to add a disclaimer to that Reference thread!