changes to a SmartEngine blog module

We have a site [login to view URL] that has a blog. We need some changes in the way the blog shows the data based on category We need to have ONLY specific members be able to post to certain blog categories. For instance, In [login to view URL], we have 4 blog categories. We need to make sure that a specific member (Contributer1) can only post to one specific category (Banks & Brokers? and have ONLY those blogs viewable to a certain page.