I have a synth made of 503 photos of a car (http://photosynth.net/view.aspx?cid=0e695fb6-016c-4a14-b6ee-127dfe939712). While it worked very well, if you look at the photos that didn't make the final synth, while some were simply too out-of-focus or dark to work, I felt a bit disappointed that others didn't make it.
Could the software be made, at the user's discretion, to pay closer attention to photos with the trade-off of speed? Would it would be possible to preview a synth before uploading, and notify the software of where those outcast photos might fit? By that I mean, you could link a given photo to a certain area of the point cloud, or perhaps to an area of another photo, and tell Photosynth to concentrate on locating it there.
My mistake was in not taking enough intermediate photos and going straight for closeups - I think options like these could help a lot.
Of course, if you're already working on something like this, then thanks. Just a suggestion ;)