It'd be nice if I could change the Thumbnail photo, and, independently, the Starting Position photo, from the Photo Grid View, after the synth is complete and uploaded, much like the current "Rename" title, "Edit" comments, and "Tags" features. Currently Photosynth just uses the "first" photo based on the filename (under Windows anyway) as the thumbnail. My trick is to pick the thumbnail I want and rename the photo so that it's the first filename. I'd like not to have to use this trick. And currently I don't know how Photosynth decides which photo is the Starting Position in the Synth View -- sometimes its choices are not so good -- I'd like to be able to pick which photo as the Starting Position.