Hi 8880 - If you already have the pics loaded into the listing and then change your mind, I really don't see the problem. The process of clicking "remove" and then reloading the pics into the listing in the new order, shouldn't take more than a few seconds, unless you're loading a full 24 pics. Or am I still not getting this? I'm assuming of course that the pics have been uploaded to Auctiva. On the other hand, externally hosted images WOULD be a hassle, since you would have to re-paste each URL one at a time. Yikes, no thanks.
Maybe in a spare moment, engineering can give us a drag and drop arrangement whereby we can re-arrange the order with just a little mouse action, kind of like the old shell game. "ok folks, step right up!"