Not sure what title I should have used for this thread, but anyway I stumbled upon a CMS for another forum software and it's basically the kind of CMS I always wanted for XenForo. It's fully integrated, has categories and sub-categories, even tags! (@Jaxel), support for multiple categories, widgets, comments, an archive. And for some reason it's free (even for commercial use), not crowdfunded, but supported. You can check the demo out here. If such a CMS would be made for XenForo, surely this would make some folks happy.