Best way to backdrop a backdrop


Tried something today that made me want to ask this. Say I have two groups of nodes in backdrops, so two backdrops. I want to place both of those in a larger one. Currently, the newest backdrop takes priority and obscures the previous ones. The way around this is to take the nodes out of their backdrops, create the master one, then recreate and regroup the original nodes with new backdrops inside the big one. Would it be possible to be able to toggle the behavior, or even change the hierarchy?