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The overhead for injecting my own GuiFactories is fairly small. 1-2 methods tops, getting the private field and adding a value to the hashmap inside. This is done once, at runtime.

However, forge uses reflection to create a GuiConfig each time you hit the button. You pass it a class name, it will crawl the constructors and instantiate it itself. This is done in an Instanced method (IModGuiFactory), but expects a Static value (class name). Letting us pass an instance would be much, much more efficient, as well as being miles more flexible.