I wanted really to improve our actual category system on the TDF wiki, but there were many reasons I did not. One of the reasons was that we don’t have any tools installed which help the user (including myself) and you have to do it “the old way” using the source code knowing the actual category.
We had already the Extension:Gadgets installed and thus I simply imported the description and the Wikipedia Gadget HotCat. 🙂 It is disabled by default. You simply have to go to [[Special:Preferences]], click on the tab Gadgets and activate HotCat.
Afterwards when visiting a page you will see at the bottom a Plus sign (+). When you click that you can easily (with suggestions!) add new categories. 🙂
For more information about this Gadget simply read Wikipedia’s manual.
If you want more or other features installed, simply ping me. Most are very easy to install and I’m very happy if I can help you to improve our wiki. 😉