I am going to be adding two new elements to my CMS, both on the advise of others. I will be adding a module for comments (thanks Kathleen), and a module for plugins (thanks Dave).
The comments will be applicable to any article, post, or content therein. Anything that isn't a container. The plugin support will be added to make the CMS as extensible as possible. And also keep addons working, instead of breaking when I makwe a change to the core.