how can I allow a discussion only for users having a certain role (e.g. Moderator). All the other user roles (e.g. Member) shouldn't see the discussion. Is this possible anyhow?
In the dashboard, go to categories, then select the category and set "This category has custom permissions."
Oh that was fast. Thanks a lot! Ok, that works, although I'd like to do this more finegrained on discussion level because I use my categories to structure my forum. But, I can use a "hidden" category for this purpose. So it works