Hi Alex,
Could you please expand your question. If you are asking whether this file can be served by the gateway in the same way that kid templates are served, then the answer is no.
However the webbrickgateway.xml file is read in on start up and is processed by the Persist EventHandler. therefore all its content is available in form of events, which can be accessed via a web browser using /eventstate/<event_source>. All changes that get written to the webbrickgateway.xml file are results of events and hence are also available using the same method.