how to export custom installed module(s) configurations?
These are my finding. Drush provides the sync, using mysql dump and restore as complete, not the changes made after some interval.
Many things can be tracked with


Configuration Module
Features
Extra Features


Please see the presentation for futher.
https://docs.google.com/file/d/0B6Sp-HBmxgGMMnhhQXVrR1hDUVU/edit?usp=sharing