I took a look at the code and was surprised to find Magnolia Promenade is not filtered at all. It's currently a nexus of all the worlds. I'm of the opinion that small worlds like Forgotten Hollow and Glimmerbrook should be fairly isolated, but I am warm to the idea of Magnolia Promenade using the Willow Creek filter. I will continue to look into a soft filter for the mod, too. Stay tuned.