Sorry, I hadn't enabled the commenting on that category. This needs to be done manually every time a new category is added. Easy to forget

The idea is actually to have users submit content to those categories as well. For instance, your post here would've been a great submission. All posts would of course need to be moderated before publishing. But I think that would be the optimal work flow, don't you think?
I just need to get a good user/group access system up and running so I can add users into certain groups and give them extraordinary privileges in specific parts of the site.
You could be a moderator for the support sections. Would you like that?
With this system in place, much more content could be added and the organization would be become less centralized.
As soon as I get some time, I will post this suggestion to the To-do List so you'll be able to keep track of it's progress, and comment on it.