This would be amazing.
Use case: A single pedal board with a snapshot for each section of a tune. Basically, a preset for every song, and snapshots for every section - presumably avoiding any "loading delay/crossfade" that you would experience by just using presets.
I would think of this as a performance mode, and would align majorly with how lots of people think about the dynamics of a tune. More than anything it would allow me to perform on stage, instead of thinking/worrying about selecting/deselecting effects on the fly while I may or may not be singing.
+1000