Tom,

You are correct that this is the proper procedure that you will need to stop the replication then add the new replicated volumes in to the failover task.

This is also similar when increasing the iSCSI Logical volumes that use the manual replication where you have to stop the replication and then expand the logical volume then re-enable the replication task for both the source and destination.

In future releases we will look into this to make it seamless.