I think it would be good to save plot overlays. If we could make our newly composited result plot into a single unique plot rather than just having the temporary overlay, then we could link the overlays between multiple study files and compare easier.
It would also make it easier returning to the analysis if the overlay is already saved and we don't have to re-do the overlay.
I'm sure I could setup a script for this, but it would be nice if it was a feature rather than a workaround.