Add new Moderation category?

Is it possible to add a new category (beyond Spam and Language) to Moderation? I'd like to flag topics as inappropriate for the site and also flag posts that misinterpret the subject matter.

There's are also two moderation-reason messages and I'd like to either eliminate them or add another topic for inappropriate topic.

Thanks! Looks like a slick plugin.

Oh, one other question: is there any way to add "report this" to an excerpt as well as a post?