Board Thread:General Wiki Discussion/@comment-3235402-20121205143814/@comment-3235402-20121206141748

You don't write it yourself. You copy/paste a bunch of code, and customize it. :)

For one thing, there's Advanced Oasis UI (User Interface). It adds, for example, a Contributions link to your drop-down in the far top header (under your username). It also makes category redlinks red again. However, it's against the Terms of Use for whole-wiki use ("messes with it" too much), so it can only be used in your own custom JavaScript page.