What rights would I need to grant to allow a DLP user to also be able to maintain the Sender / Recipient Patterns?
Release : 15.8
Reusable Sender/Recipient Patterns make policy creation and management easier for policies using such patterns. This is part of the Policy Management
As per the Configuring roles section in the Symantec Data Loss Prevention Help Center You can configure a ROLE and assign "Author Policies" and select the Policy Groups that should be allowed to author - You can select "All Policy Groups" if you wish to grant the user configure the Sender / Recipient Patterns for all policy groups.