Have you looked at SAP note 1796928? This is roughly the method we used to ensure that all completed WBTs are confirmed and followed up. It's not a batch job but happens online when the status is updated to completed.
We also had to change a setting when publishing to ensure that completions aren't registered incorrectly when a connection is terminated. See 746917, bullet #5 for more information.
Regards,
Trina Miller