It would also help if there was a page in the documentation listing all the
meta pages that are user interface pages.
There's a big long list of them if you go to Special:Allpages and change to
namespace 8. However, there are more that are NOT listed here in the
default installation, but are redlinks.
For example, Community Portal, Searching, Searchresulttext, Protected page
guidelines, just to list a few. All of these are empty or non-existant in
the default installation.
A map of meta pages and the pages they link to that are hardcoded and
burried in the user interface would be quite helpful. (Hmm, I wonder how
hard it would be to make a graphvis of that automatically.)