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Even if it will be an advanced feature, I think it makes sense to keep that in mind from the begining: An activity-item should carry the ACL of the original item with it. The best way would be if the plugin submits the ACL-State of the item, so the Activity itself can have the same publishing-options as the original item (Blog, Posting, Comment, Event,..)
It is currently a weekend from where we are at. Some answers may already be available on our documentation at http://stackideas.com/docs
Rest assured that we will get back to your posts as soon as the week starts!