There are some blog posts and info on using the FDK with the DAY CMS for FM that might shed some light on how to adapt the FDK to use in Extendscript. See:
https://www.adobe.com/cfusion/event/index.cfm?event=register_no_session&id=2002873&loc=en_ us <-- recording of Tom's webinar on the connector
Otherwise, I don't think there's any specific info on Extendscript and the CMS connector available.
I hope this helps,