If you have developed a specific extension for which you would like to share its content between different websites that you would like to see declared into Jms Multi Sites then send us this extension in the attachement of an email and we will review it to see if we can add its definition in a next release of JMS.
If you don't want that this extension is defined as a know extension in Jms Multi Sites and that you just want to have its definition only for you, it is possible that we develop a specific plugin that will modify the existing Jms Multi Sites definition.
Such plugin can generally be developed with 1 hour of support.
The advantage of this second solution is that you can modify the plugin definition and continue receive the Jms Multi Sites update.
If you try hack Jms Multi Sites, you will not be able to receive the update as your hack will be destroyed at each release of Jms.
So the solution is either to declare your extension in Jms Multi Sites itself
or create a specific plugin that will modify the standard JMS definition.
Our email address is present in the "contact us" menu
www.jms2win.com/en/contact
The support can be ordered at
www.jms2win.com/en/joomla-multisite?page...35&category_id=1