The Data Router uses a numeric feedID as the unique identifier for a provisioned feed.  The feedID is generated by DR at provisioning time.  Since this feedID is not known in advance, a subscriber must first determine the current feedID for the Feed it wishes to subscribe to.

A Feed is created with a FeedName and that value would be known to a subscriber.  The subscriber can query Bus Controller using the FeedName, and determine the feedID.  But this isn't so convenient.

An enhancement would allow a request to add a subscriber to directly specify the FeedName instead of feedID.  The processing would only proceed if a single match was found.