if could create a node that allows procedural spawning of actors into sub-levels it would be much appreciated! 
Right now it is hard to (procedurally) take advantage of streaming in a BP only project because the nodes that spawn do so only in the persistent level and not the stream-able sub-levels.
For instance, I spawn 2 extra maps in the persistent level to simulate my world wrap, and that means up to 200,000 additional meshes in the world that I would prefer to stream in when you are actually looking at them.
Thanks for any help you can provide!