[Tiny feature request] Duplicate folders along with sub folders in the World Outliner

I am building a game in which I have two duplicates of the world geometry in each and every map.
This means that I have to duplicate each level and each levels folder structure for every map. Doing this manually takes a bit of time, and adding a “duplicate folder” option to the World Outliner should not be too hard.

Is there any chance that this could be added? A feature similar to Ctrl + D (duplicate) used in Unity.