User blog comment:BertH/Layout and navigation updates coming October 3/@comment-737801-20120927141553/@comment-13301-20120927192525

Wikia's saying about how much customizable are wikis on wikia is... well... a half lie. They practically allow only customizations through Special:ThemeDesigner, so you're only able to customize colors and backgounds, and even that is restricted when it comes to links to uncreated categories (see Forum:Category redlinks not red)...

Even most things on WikiFeatures end being mandatory after time.