Create a permission group, for example moderator-off-duty
with the permission:
<Permission Cooldown="0">duty.moderator</Permission>
This permission will allow that player with this permission to enable duty for moderator, becuase in Duty configuration you have Permission
set to duty.moderator
<DutyGroup Name="Moderator">
<PermissionGroup>Moderator</PermissionGroup>
<Permission>duty.moderator</Permission>
<Settings>
<GodMode>true</GodMode>
<Vanish>true</Vanish>
<AdminBlueHammer>false</AdminBlueHammer>
<AdminFreecam>true</AdminFreecam>
<AdminEsp>true</AdminEsp>
<AdminBuilding>true</AdminBuilding>
<BlockDamageToPlayers>true</BlockDamageToPlayers>
<BlockStructureDamage>true</BlockStructureDamage>
<BlockBarricadeDamage>true</BlockBarricadeDamage>
<BlockStorageInteraction>true</BlockStorageInteraction>
<BlockItemPickup>true</BlockItemPickup>
</Settings>
</DutyGroup>