Hello! I got a little carried away with the demo but decided it's good enough to release now, I'll likely update it again in the near future to add in a few more ideas but for now it shows plenty of how boundaries work and I don't want to leave you hanging longer over nit picking details.
Give it a look, I hope it helps you!
There is also an update for the Event Spawner to v1.8 which includes an optimization improvement for auto boundaries as well.
Just download the new demo and unzip it, place the Event Spawner (preferably the newest version 1.8) and the Boundary system (Your existing copy should be up to date) plugins into the demo projects js/plugins folder then enable the Event Spawner and the Boundary system in the demo projects plugin manager.