Actually to be as clear as possible -  putting things in an active Explore game through the Editor is something that we plan to disable when we move out of Early Access (again - active Explore games only, not active games in general). It makes sense for now because there are still quite enough bugs and some features are missing / don't work as expected. All this should be fixed before we leave Early Access and new features (one very important is actually coming in 0.9) will make this unnecessary. We want the Explore mode to be challenging (especially when we add boss characters and new worlds) and being able to simply edit your saved game at any point goes against that :). 

That being said it might be possible in future to place compositions into non-Explore active games, but it's not and easy task and just as my colleague said, it's very low on our list of things to do.
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