msgcache questions

The msgcache manpage says:

   NOTE: When using msgcache, the BBDISP setting for the clients

should be BBDISP=127.0.0.1 instead of pointing at the real Hobbit server.

Are you supposed to do that via the HOBBITSERVERS setting in /etc/defaults/hobbit-client? I can't find any doc about setting BBDISP, but it looks like that's where the hobbit-client init script gets the data for the BBDISP setting it puts in the runtime config.