I often edit imported posts and sometimes I edit imported posts to the point they are completely original posts with (maybe) a link to the post that inspired the changes I've made. I mark these as "DO NOT DELETE" but it appears they count toward the number of posts RSS Multi Importer keeps in inventory.
On the manage posts tab, I'd love it if you added an option to mark a post as no longer an RSS Multi Importer post.
BTW, a "delete" link would be almost as helpful as a "Do Not Delete" button.
Lastly, is it possible to keep the uploaded images while deleting the posts?