Great Plugin. I was trying to write my own solution when I found this gem. I do have one issue and was wondering if your plugin can do it:
The permalink structure is currently at /blog/%postname%/.
So, the permalink for a post is /blog/my-post-name/. I have a custom post type called "listing" so the permalink structure for that is then /blog/listing/my-listing-name/
I don't want the prefix "blog" to show up in my custom post type's permalink structure. I just want it to show up as /listing/my-listing-name/. Is this possible?