Are you suggesting, then, that the third amendment allows for quartering anyone who isn't a member of the military, and for soldiers to stay in people's homes as long as they're not sleeping there?
I think this is a reading so narrow as to render the amendment virtually meaningless.
You're more intelligent than this. If the amendment is narrow, that's because it referred to something rather specific. When the British occupied Boston, they expected the citizens thereof to provide a place for the soldiers to live. From what I've read, this was usually a large building, such as a warehouse, or meeting hall (I don't recall whether they had to provide food). The point, as far as the Patriots were concerned, was being forced to provide for an army sent to oppress them. The amendment was written when the memories of the British occupation were about as fresh as our memories of the Sept. 11th attacks, so I guess it didn't seem meaningless to them.
But if amendment 3 is meaningless, that would explain the articles linked in the OP, citing a lack of case law; or why the notion of a 3rd Amendment watchdog group is treated as a joke. So if I'm saying that the 3rd Amendment is meaningless, I'm certainly not the only one.
I'm hoping you never make it to the U.S. Supreme Court. You seem to want to interpret laws to make them be all they can be, rather than accepting that they mean what they say - and no more. If those who wrote the BOR, and ratified it, had meant to keep all government employees from hanging out on private property, they could have just said so. Instead, they wrote a rather narrowly-tailored amendment. Whether we like it or not.