How to create a container category?

I'm running a newspaper site, and I'm allowing users to post their own articles online. Articles are classified into sections, which are defined using a vocabulary. One of the sections is for reviews, and there are two child categories of reviews: courses & programs. Is there a way to define the reviews section as a container, so that people cannot post under "Reviews" without choosing one of the child categories? I have seen containers in the forum taxonomy, but I haven't found a way to create containers outside of the forums section.