I have found "Properties Editor" in the toolbar at the bottom of the screen. Is that it?
One item of note: If I select a landmark rather than a street, it comes up saying City, Street, etc are blank. Landmarks don't have a "street" entry in them. If you edit the address information for a landmark in the regular editor, it has places for country, state & city. The landmark I'm looking at as I type this already has values plugged into those sections, which I'm guessing it got from the location of the landmark when it was created.
The "Properties Editor" seems (from the fields showing within it) to be aimed at streets. It does show proper, already existing values when I select a street. What's going to happen to a landmark if someone uses this on it and actually save their changes?
Edit: One other thing I just discovered - the roundabout tools are grayed out and aren't working now. Is that a bug, or did you decide that Rank 2 editors shouldn't have access to it?