this is a feature request. But, it would be nice if you could remove/hide categories from showing in the pop-up box. My theme uses a headline and features category to show post in certain places of the site, but these aren't really categories people would filter for, they are just used for the putting the headline story on the homepage and same for featured stories. So I don't want them to show as a category in the box, when it pops up.
If, you are actively maintaining this great little nugget, please consider adding this.