It would be very useful if the export persona allowed us to choose what layers were exported for each slice.
I do complicated graphs that build up from simpler ideas. So it is useful to put the basic graph on one layer, some enhancements on another layer, and perhaps point out some specific features on a third layer. I then want to export this as three separate images: Just layer 1, Layers 1+2, and Layers 1+3. At the moment the only way I've found to do this is to manually change the visibility of the layers and the name of the exported file and then export one file. This process needs to be repeated three times in my example.
I can also imagine that icon designers would find this useful. They could have a layer with the basic icon and then other layers with overlays (check marks, or plusses etc). If there was the possibility of selecting which layers were visible for each slice they could set up batch exports for these.