A PC game is a sum of several parts and all need to be in balance to run smoothly. As it is the engine already has issues with some of the largest maps if you put a lot of objects in them (because of memory). Fixing that is already a little delicate but what you asked would require so much memory that it would essentially require a rewrite of the engine (which, obviously, is totally out of question). Do not expect 2012 features in a PC game engine that was written more than ten years ago. That is not going to work.
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