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Good article that shows quite well what's wrong with UE4's CSG workflow

Epic devs, please read this: http://www.gamasutra.com/blogs/RobinYannStorm/20160503/271373/Dont_fear_the_Hammer_The_importance_of_UX_in_editors__tools.php (although I am sure you are aware of this particular issue already)

I think we already talked about that in extended post, other thing is if they are interested in add it or they will use it or no, you should use the same post there is created for GSC