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There's not a good way for us to accomplish this. The scenery system is composed of many different layers, and we don't have a good way to track which scenery elements come from which pack (and, if the scenery pack changes to add or remove elements, which pack we should treat as "canonical" in an update).
The only reliable way for us to implement the reload function is to reload the whole region, starting from scratch essentially.
This site is no longer being actively maintained.