Sounds great!
Assuming this field links a replication task to a periodic snapshot task, I would have expected, that a user choice in this field auto-fills certain other fields like dataset source and destination, snapshot naming schema and schedule by reading from linked snapshot task. Otherwise you might get inconsistencies.
Hence I’ve the feeling to still not have understood this field fully. Will give it some more testing.
Being new to TrueNAS/ZFS, I am quite happy to have this appliance GUI at hand, to not shoot myself in the foot!