I may be confused but it sounds like you are describing the old behavior, which 6.5.3 exhibits.
Yes. But certain configurations of 7.0 do *not* have that problem. I have user quotas under a qtree in a traditional volume that show the "correct" answer when the user runs "df", meaning the user sees their partition sized to their quota.
All in all, I was alerted today that a Bug ID 154530 was created and will be "fixed" in a future release.
I took a look at that bug on the NOW site and it was disappointingly vague. It has a title, and nothing else.
-C.