I'm not opposed to them being in the FAQ, but I am opposed to them not being linked to prominently on the post page.

That sounds like a good idea, but it would require a change to the LW codebase. At this point, I'm aiming to pick low-hanging fruit that doesn't require me to familiarize myself with the LW code. If you want to familiarize yourself with the LW code and start contributing patches, that would be great!

In practice, users getting confused about Main VS Discussion doesn't seem to be too big of a problem, even though up to now the norms have been entirely implicit. So I'm not sure it's such a high priority that it needs to go on the about page. Though linking to the "Site Etiquette and Social Norms" section might not be a terrible idea.

If the most important ones were written using a variety of different terms so people can locate them with "find in page", even better.

If you want to fork my version of the FAQ on your own wiki page and demonstrate this, I'll take a look.

This link in the OP doesn't take me where I expected to go: "if you never get voted down, you're not posting enough".

Yeah, I changed it.