How to set default MUC properties in OpenFire 3.6.4

I have read in previous posts that it is possible to set the default MUC properties (specifically disabling the ability to change nicknames) for a new room but I have been unable to recreate their results .

Via System Properties: http://www.igniterealtime.org/community/message/155895#155895

Via the database: http://www.igniterealtime.org/community/thread/36949

It appears to be possible from what I can gleam from JM-79 and JM-949 but I can’t find any documentation on it.

Has anyone been able to successfully change these properties in OpenFire 3.6.4 without recompiling the source?

Thanks,

Andrew