a) In general modules and plugin can just be defined.
You mentioned a potential issue concerning the install with propagation into the children.
Can you tell me the version of Joomla that you are using.
I don't know the CB gallery plugin and modules.
If you want that we add the definition of these extension in JMS, you can send a the extension in the attachement of an email.
We will review them and perhaps add their definition in a next release of JMS.
b) The sharing of extension content is limited to some extensions and require a manual review of the extension to discover the data model and ensure that the extension does not perform any queries outside of its own tables (except the users that can be shared).
So check in the list of extension can be shared or not.
www.jms2win.com/en/list-of-extensions?vi...id=269&Itemid=53
This link can also be accessed via the "help" button present in the JMS Tool menu.