Hi there! Don is it?
There are two simple ways to accomplish what Blaise was demonstrating there.
1) Use the comma key [,] to move forward through your photos alphabetically based on their filenames and the fullstop key [.] to move reverse alphabetically. This really only works well with synths that are close to 100% synthy (yours is a good candidate but has a few weak connections).
http://mslabs-777.vo.llnwd.net/e1/documentation/Photosynth Guide v8.pdf - scroll to the end for keyboard commands.)
2) To dictate the order that others view your photos in, make sure you're logged into your account here on the site, view your synth, and click the 'Edit Synth and Highlights' button. Choose the 'Settings' tab, set the 'Slideshow Order' to 'By Filename', and click 'Save'. This will make it so that everyone views the synth in original order.