@vij You might want to reach out to firstname.lastname@example.org
I don't know their plugin pricing but those features don't sound like too much effort. And if you allow it to be licensed at their will (please be more precise on this, "sell them to others" might be more restrictive than you want to be) it might give you bonus points 😉
I myself don't have much spare time right now, so I'm out of this.
Individual post permissions.
It's late and I'm probably just not thinking clearly but is it possible to have an entire category listing be hidden to registered users except for a single post?
Alternatively - is it possible to show a block of text above a specific category when a user goes into it? Though I imagine if you have listing disabled they won't be able to get into the forum to even write a post there.. Hmmnn.
Essentially I want a forum that no one but a specific user class has access to list and see what is inside, but any registered user can actually post to that forum (if that makes sense).
Honestly? I'm not sure if this can be done with the privilege system... you could try it?
Give access and topic create permissions to registered users, and nothing else...