Well, it didn't work out as I had hoped. My users liked having the index. but complained that the attachments counted against them for uploads into the Photo Galleries. They also got confused by the two things being in the same area (Attachments werent considered part of the Photo Galleries).
What I ended up doing is installing a second PhotoPost gallery and tailored it to this specific use:
http://www.viperalley.com/attach/index.php?Cat=0Attachments all go into one directory and then are inserted into the database based on the forum they posted to (each forum has its own category). Then I modified PhotoPost to "fake" getting every image from the single directory while presenting to the user the illusion of categories.
I didn't document it since it didn't really work out.
