We've pretty much been running with the same list of content categories for 6 months without any changes. For the most part, they seem to cover the majority of the types of discussions and documents contributed. We have no interest in changing something that seems to be working just for the sake of changing it, nor do we have any plans to provide tons of categories for every scenario imaginable.
But we certainly want to get the community's feedback if there are topics we can add to help better categorize your content. Are we completely missing something? Have you posted a discussion or document and found that there weren't any categories that fit your specific scenario? Let us know below and we will take your feedback into consideration.