I have heard that if you would like your book listed in a category that is not listed on kindle, you can contact them and have them list your book under that particular category. Has anyone heard of this?
Click "Contact Us" at the bottom of the page, click "Book Details," and select "Categories and Keywords." Fill in the identifying information for the book, delete any information you're not requesting intervention about, and enter the complete "Desired Category Path." They'll take care of it within a couple of days.