Adding Levels in World Composition Mode

Is there a way to add a single level to a WCS game without re-loading the persistent level?
The World Composition System makes managing levels a bit of a pain. I miss the flexibility of simply tagging a level as “blueprint” or not when deciding what should show up in game while having easy access to temporary and special purpose levels. Right now, enable a special level, we add it under the persistent level and then wait to re-load the whole game…
-Donald