I understand that knowing something is broken isn't an automatic thing. We discussed the wiki briefly in chat and Alurra chimed in and would mention the issue in some regular scheduled meeting. She made a note of having done so in her update of a few days ago. I think part of the problem is that we don't really know who to communicate with. It's probably mentioned somewhere, but data-mining is hard work!
I've checked the wiki and I seem to be able to create pages from links. It doesn't solve the problem though, or at least appears not to. I'll explain:
If I go to "Faction items and NPCs" from the front page, I can click through a non-existing page (red link) from there or edit the source and create a new such link. That method seems to be working although I haven't clicked through and actually created a page. The "Create" button is available however.
But if I choose the drop location link just above, I'm directed to a Category page which I cannot edit. There's actually nothing to edit on that page. So how can we add new pages to that list? I tried the discussion tab there, but that isn't really helpful.