Pierre,
Basically today the value of using the SMSQL or SME plugins is essentially just the centrally scheduling (or SPOG) as you mention.
This is primarily a benefot for backup and monitoring - the SMSQL and SME plugins just use PowerShell commandlets to call the SnapManager product.
The backups actually happen through SnapManager - Snap Creator essentially acts as a scheduling engine.
We have a long term solution for this on our roadmap - more details will be available as we can share them.
Thanks,
John
Note: Sorry for the delay in response. Due to the platform change no one from the SC team has been getting notified when new comments are posted. We're working to resolve this.