Sorry, assumption.
There's multiple themes that try to emulate CoverFlow, but cannot. They have static background images. The theme authors even bother to put such disclaimers in their descriptions, which infers a shortcoming in it's implementation.
What I am suggesting, since there's already a mechanism to do a screendump, to snapshot the screen inside Pictureflow when an album is selected, before it does the zoom-n-rotate animation or jumps back to the WPS depending on your WPS Integration setting, and utilize said snapshot as the current %X backdrop.
The goal being to make Pictureflow behave more like the software it's emulating.
It seems a basic enough concept, which is why I asked if there's something I'm not seeing that would make implementing it a hassle, as I would assume someone else had thought of this already.