I haven't really thought this through, so I'm throwing it out for discussion.
Along the lines of being able to skim, it would be nice to be able to make changes to the URLs the thumbs are linked to.
Maybe have a "link path" variable that we could point to a trade script. The issue here, of course, would be restoring the appropriate link from the trade script out to your site.
I know that with perl and PHP it's pretty easy to grab URL variables from the oncoming URL and replace them in the outgoing URL, so that shouldn't be too hard. You may have to supply the "tttout.php" script with URL mods for TTT and whatever other trade scripts people are using. Or, supply a patch for it, as I know Choker doesn't allow unapproved modifications to his free scripts.
Here's a big one - add title and alt elements to the thumbnails and HREFs for search engine food. This isn't something we as end users could do very well - would have to happen on your end. I don't know how your back end works, but I'm guessing the sponsors would have to supply the galleries with those text items included.
Along the same lines, gallery descriptions would be nice
Just food for thought -