autoblog in wordpress multisite

hi,
im using autoblog in wordpress 3.0.2 multisite (ex : blog.com).
first i try install in folder mu-plugin. but entire user in multisite can access autoblog control panel, and add feed freely..from any feed to any blog they want. im not sure how this could happen..

then i tried install in folder plugin, so the user can activate it manually whenever they want.
then i login as user blog, such demo.blog.com, i tried activate autoblog plugin. unfortunately in control panel auto blog, i still can add feed from any source to any blog in dropdown blog list.

it should be only add feed to demo.blog.com and dont have have any privileges to published in another blog, even the plugin give access to publish feed in global blog.com

please help here