There are more Moira programs than just listmaint and chfn. The program moira is the master Moira client. You could also have changed any of this information from the moira program, but it would have been slightly more complicated to do so.
To find more information on these other programs, refer to moira locker, which contains binaries and manual pages for the various moira clients. These programs are listed in the file README in /mit/moira.