Many users will hope to allow HTML to category description. Although this matter has been asked in the past many times, I think the exact hack way has not yet been shown.
Now, members of ASKIVE are studying it in ASKIVE based on "CKEditor For Admin" plugin. To achieve this, it is necessary to hack multiple sources. However, there will be worth. I hope that users who are interested in this matter participate in the thread (Requires knowledge of HTML and PHP). Of cource, I also welcome the participation of developers of Q2A core.