Support offline synchronization between client and server with ability to set conflict/resolution such as server overrides request.
Example implementations:
Pouch/Couch
Take a look at Couchbase Mobile and Sync Gateway
Another interesting project that I looked at for sync but it is beyond me to implement is
Dexie Syncable
At any rate it would really be nice to have an offline database that would sync back to dreamfactory when online as well as handle conflict/resolution when other clients also come back online.