(Usa2k here BTW) Just a quick site test.
$UploadPrefixFmt = '/$Group/$Name' breaks other images ...
Mini worked off-line in a stock pmwiki test site with the above setting.
New test here http://www.solaroof.org/wiki/GalleryTest/20110508
OK, site is restructured to display images in a new structure. Attach will now use this structure.
More experiments Gallery.Gallery Test
We have a header and left and right columns - can we have a footer to every page of a group to offer the comment box feature - we could try this to see if it is useful and might encourage more participation.