One set-and-forget version, coming up.....
bpimagelist -media -U -hoursago <x>
So if you want all the media used in the last 168 hours (7 days*24 hours), you'd run "bpimagelist -media -U -hoursago 168". And no need to touch it to modify dates every week.
That work for ya ?
And Tom, of course they did it on purpose -it was absolutely to get extra cash out of us. Haven't you seen how they license NBU ? =)