I'd made a request for synth playlists until we get synth linking and I also asked for a movement direction switch there.
Within that context when you're trying to get one synth to move into the next as seamlessly as possible, direction does matter.
I will say that with spins that do not connect a full 360°, it is possible to simply set the starting image of the synth on the side you wich to begin on and when the synth autoplays, it will by necessity move in the chronological direction because it has nowhere else to go, rather than letting it start in the center of the arc, by default, and potentially move in a reverse chronological direction.
For the Photosynth team, I would turn your question around at you. "Can you please point me to a synth where the playing the photos in an order inverse to the capture order really matters a lot?"