I think you are confused. This section would be only be accessible by members who ask for permission. You do not have to disguise your thread title so that only certain members would open it.
That's what I meant, there's a probablity that some members would not ask for permission and a potential that a large number of members would not ask permission to access that section.
Even if all accessed the section, what topics would be appropriate to open in that section and not in any other section.