This is absolutely, positively, never going to happen. It's been suggested hundreds of times on dozens of sites and the answer is always the same (including answers from both of the founders and various other SE employees).
The FAQ is the FAQ; questions that are frequently asked. You are, quite unambiguously, referring to the questions that are infrequently asked. Important, of course - but nevertheless very infrequent.
Krug, my favourite usability expert, refers to these as "marketing pitches masquerading as FAQs (also known as QWWPWAs: Questions We Wish People Would Ask)". Not that I'm deliberately trying to be patronizing, but those of us who've been playing this gig for a while have long since come to terms with the fact that nobody is asking any of these questions... that is, of course, until they've been personally affected by one, and that's exactly the time to direct them to meta, where they can get a detailed and definitive answer rather than a one-liner. Even then, they're only looking for answer to that specific question, not a detailed explanation of everything on the site.
It would be nice if everybody who came wanted to know everything about the site right away and would follow all of those site philosophy/culture/guideline links right off the bat, but it's just wishful thinking and usually counterproductive inasmuch as it erodes trust in the reliability of other in-site resources. People want to find out just barely enough to get their question answered and move on with their lives; this isn't cynicism, it's reality. Normal people don't optimize, they satisfice, and if we fail to recognize that then we just lose more potential questions and views. If some of those people happen to stick around to contribute and/or ask better/deeper questions over time, that's just gravy, but anyway those are the types of people who will avail themselves of meta without being asked or told.
The FAQ is sacred space, dedicated to helping people use the site. Much as we would love for everybody to know certain things, you must understand that the FAQ is exclusively for their benefit, not ours. I might argue that there's already far too much in the FAQ that's not really "FA", but one thing is for sure, any attempt to use it to lecture members (new or otherwise) is only going to make it less useful/usable and lower the reading rate even further.
So, no, to be totally blunt - the FAQ isn't a detailed rule book, nor is it a table of contents for the rule book, nor is it ever going to be. That's what meta and featured and how to ask and how to answer and all of the various tag wikis are for.