I’ve seen the project wiki page regarding the ‘Customer-named snapshots and volumes’ and I would like to know if this feature will be available on 3.8.
Yes, this feature is available in 3.8. You can specify the prefix to volumes, qtrees and snapshots
The other thing is regarding the ‘new-volume-being-created-every-backup’ feature. Is it optional? Can it be bypassed?
As far as I know, a volume will be created on the secondary when a backup relationship is created. The subsequent backups do not create a new volume. As a matter of fact, in 3.8 we have a new option "dpDynamicSecondarySizing" which automaticaly resizes the secondary volumes.