Yes, I can verify the author is left handed. I had a command line flag to remap the mouse buttons for you right-ies.
The $HomeMovie video encoding format was quite MGR specific, and designed to run on a Sun 2/120 over a 14.k-baud modem (for typical MGR windows) in real-time; it was possible to transfer MGR sessions to remote workstations.
Nice article, by the way.