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This will never happen, because of geometry and the resulting combinatorial explosion of the necessary building pieces. I wrote a more detailed explanation a while ago, you can read it here.
I’m pretty sure they won’t do this, either, at least not in the base game, to avoid abuse of that on PVP servers. They had to go out of their way to impose additional restrictions on how close you can place certain building pieces, due to a popular abuse of building techniques called “fence foundation stacking”.
However, if you’re on PC and you’re open to playing either on private servers or in single-player (as opposed to playing on official servers only), I’m pretty sure that @Multigun’s LBPR mod (Less Building Placement Restrictions) can do what you need.