Allow thread starters to make their new thread invisible to certain usergroups

[mightyb]

I could not find an existing solution anywhere.

Is there any way to allow thread starters to make their thread invisible to certain usergroups? It would also be great to have an appropriate icon displayed next to the thread indicating whether it's private or restricted to certain usergroup so that those members who have access to all threads can see which groups OP restricted from seeing the thread.

Thank you!