Maybe! Feel free to put it there if you think it belongs! My personal opinion is that Joomla! and these other one-click applications have thriving and complete online communities, and I don't know the the DreamHost wiki should really try to document all the nuances and customization tips to operate an application.
That said, the wiki is a community resource,and if you think it should be in there add it!
The wiki gnomes will edit, and refactor, as they do, and it will either stay or not - which is the way all these wiki things work!
--DreamHost Tech Support