It is not enabled as a supported category for Minion, as it isn't a category that we generally want everyone (beta access or not) to have access to all the time (beta servers active or not).
Unless Dolby feels differently and wishes to enable it, you'll have to install addons the normal way.
http://www.wowinterface.com/forums/f..._howto_install
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh