Quality Notification Help

I need your help regarding below queries -

1. Is there a way for us to update a custom field value in QMEL table for a completed QN without reopening/putting the QN back in process?

2. BAPI QUALNOT RELSTAT - Does this BAPI re-creates the QN tasks once QN is put back in process? If yes, what can be done to avoid re-creation of the QN tasks. I mean can we just put the QN back in progress without recreating the QN tasks?