But that's an instanced -map-. I didn't really know you could instance controlled areas.
Once you are in an instance of one map you enter the same instance of all other maps that are connected with this one.
So basically the whole world is instanced once you switched, except the maps you're entering by special means (tutorial, DR etc).
Sorry to disappoint you, but I thought of the idea first
I said this in regard of the posts in this thread, not globally. I haven't seen these ideas in this thread mentioned before, but if I'm wrong, sorry.
Btw, we already had one event that used the instancing of a map (hydlaa_plaza) as plot element few weeks ago. I just think we can use this means specifically to "uncrowd" events if necessary.
On a sidenote: An everlasting item on our GM wishlist is to control NPCs directly as character for events which would help again in making events look more spontaneous and fit better into settings, but until this is implemented I can truely resort to the infamous "soon(tm)(c)(r)".