Lock regions for default panelizer pages

I would like to propose a new feature that allows content editors with access to the panelizer tab on entity types to set the locked state also for the default display. I didn't find a way of locking a region not only per entity, but globally per entity type (until otherwhise overridden on a per-entity base). Maybe I overlooked something?

I'll provide a patch with something that works for me to better explain what I mean.