Hierarchy across custom post types

Are there plans to integrate real post -> post hierarchy that crosses custom posts types (or is it there and i missed it?)

Ex: An event may have many seminars. Each might be a custom post types but there is a clear normalized relationship between these.

I am using the post excellent Post 2 Posts ( https://github.com/scribu/wp-posts-to-posts/wiki ) plugin for this but it feels like a feature that should be a native part of CustomPress.

Tx!