see also https://sourceforge.net/p/mrbs/patches/31/
there is an update https://sourceforge.net/p/mrbs/feature-requests/160/
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for new updates check https://sourceforge.net/projects/joomlamrbs/
Joomla authentication has now been included in the default branch of MRBS. It will appear in the next release (ie the one after 1.5.0).