Thanks for your feedback, and the use of my plugin - muchly appreciated!
Currently the plugin cares about "hidden" layout stuff not available in Genesis settings or other plugins/ child themes --- focusing on various archives, taxonomies or special pages.
General - in post screen - layout support the plugin does not provide but I think about adding something like that to the next version. Problem here is: that should only be for post types that appear on frontend and have archives available -- otherwise it makes not much sense.
The current custom post type support is hand-picked from plugins/ child themes that fit into the above criteria and where it really makes sense to have more stuff available.
WooCommerce & Jigoshop have integration plugins for Genesis, as well as bbPress, these already add the inpost layout settings for Genesis. For "Easy Digital Downloads" (EDD), I made the integration plugin myself and added that too.
So all the needed logic for filtering out fitting post types might add some overbloat --- but I'll definitely think about adding some stuff to the next version (but not promising it).
Have you any specific post types from plugins or such where you'll need it?
Thanks, Dave :)