2 requests:
1) Author comment notification
2) Better integration with Role Scoper plugin. With that plugin, admins can create custom user types (i.e. "Researcher" "Student" in addition to "Author," "Contributer," etc...) In my limited testing of Co-Author Plus, the plugin will not look for the custom user types. the original Co-Author does however find these users.
http://wordpress.org/extend/plugins/co-authors-plus/
Thanks for the feedback lag47. Author comment notification is built in -- are you finding that it's not working?
I haven't tested with custom roles, so there might be an issue. I'll take a look.
Looks like this post was mis-tagged. Although Role Scoper supports custom role definitions, they are typically created by the Role Manager or Capability Manager plugin.
batmoo, feel free to contact me via http://agapetry.net if you think there is a conflict.