Allow restarting on a data source basis instead of having to restart the connector
Example 1 - OPC
If a new connection needs to be made to one OPC Server, restarting the connector forces all data sources (and potentially connections to multiple OPC Servers) to be restarted.
Example 2 - UFL
If my web service is down and I do not want to connector to keep trying to access to REST Server, I cannot stop/disable only one data source
Nathan Skitt commented
This could include stop/start functionality for each data source, as well as the renew tag list per data source without requiring a restart.