Hi,
That's the workaround for administering your developer install in Beta 2. However, we don't encourage you to edit the json file directly. Alternatively, you should use the Deployment Tool to create a "debug deployment" - which means use the debug options dialog in the Deployment Tool to enable these settings then use the LocalServer.InstallDirectory property to pickup the debug local server. We are planning to provide a utility to administer the developer settings in a future release.
Cheers
Mike