With the implementation of the Age Verification System and Age Verified 18+ instances, I believe it would be immensely beneficial if group owners could control if group members are allowed to open 'All Age Group Instances', '18+ Group Instances', or either at the members discretion. I know some groups would like to enforce that all their group instances are 18+ while others would probably like to prevent 18+ instances being opened, and some groups would like to leave the choice up to the member opening the instance. So being able to enforce those permission by group role would be immensely helpful.