I'm looking at your plugin because I try to put into a regular blog a comics section.
I created with your plugin (very easy to use, thanks !) two custom posts:
1. comics: each post will be a comics page (sorry not a WP page !)
2. stories: each post is a story and I did CPT-onomy it and attach to comics
To navigate between pages, there is no problem (I can use http://wordpress.org/extend/plugins/previous-and-next-post-in-same-taxonomy/ plugin). I hope I will manage to navigate between stories with your plugin - a problem I cannot manage with classic custom taxonomies as there is not "go to first post in next category".
So, if I am in post 3 in story C, can I make a link to post 1 in story B or D (previous and next stories). Have you some idea how to get this ?