Move frames forward and back in photo mode?

That might fall into the category of "This feature wasn't initially planned for, so it might be more problems than it's worth." The game would need to constantly be recording the animation and effect states of everything in an operation to be able to rewind and move forward. So if the game isn't already doing that, it might be a huge headache to make that happen and might even tank performance to have that constantly running in the background, depending on how the engine handles everything to begin with.

Halo 3 and newer can do this easily because the engine is set up that if you feed the same inputs into it every time, you get the same actions every time, so it has a theater mode that essentially re-feeds your recorded inputs back in to replay the match and let you move the camera wherever. But a lot of photo modes just pause the game and don't record all of the events in the game to rewind or not.
I wouldn't get my hopes on this one, even though it would be cool to have.