Joomla! - enhancement on QContacts extension

The QContacts module should be adapted in order to allow Joomla! users to be granted will specific permissions to access to each contact list individually. The enhancement that is being requested is simply to add a feature at the module backoffice so that the module administrator can add/remove user the permission to access to different lists, example: Example: Registered users on the platform: - UserA - UserB - UserC - UserD QContacts lists: - Mobile Contacts - Desk Contacts Permissions scheme: - UserA can see contacts on Mobile Contacts list only - UserB can see contacts on both Mobile Contacts list and Desk Contacts list - UserC can see contacts on and Desk Contacts list only - UserD cannot access to any of the contacts lists In attachement you can see a mokup depicting how this should be handled at the backoffice.