Filr ability to block a group of users from sharing files

Is there a way to allow all users the ability to share files externally except for a certain group of users? 

Note: review this portion of the documentation to learn how to Enable Users to Share.

Example:
With Filr 3.4.2 and earlier, you have the ability to enable all users to share files and the ability enable a group of users to share files.  But, the opposite is not an option: enable all users to share files, except a certain group.

1. Apply the 3.4.3 Filr update.
2. Stop the Filr service
• rcfilr stop
  
3. Add the following two lines to the /opt/novell/filr/apache-tomcat/webapps/ssf/WEB-INF/classes/config/ssf-ext.properties file:
• Syntax:
• enable.sharing.exception=true
• enable.sharing.exception.list=<GroupName>
• Example:
• enable.sharing.exception=true
• enable.sharing.exception.list=group1
• Change group1 to the name of the group which you want to exclude. Meaning, the group which you do not want them to have the ability to share files.
4. Start the Filr service
• rcfilr start