Something pretty useful would be to allow flagging some scenes as external. It would then export the scene layout data and code into a separate file that can be loaded using an action.
This could allow for:
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DLC: If scenes can be decoupled from the game, it would be easy to download a few more scenes and have the game load them in
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Bigger games: On bigger games, this would allow not loading all scenes for better initial loading times
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Web games: This would allow the game to load quicker on low speed internet connections by not loading everything at once