This thread does not pertain to this site
or problems that arise from its use,
I don't know usually what we shall discuss each next pair of posts
with an opponent, originally unknown.
It strongly depends on an unknown opponent's features, behaviour,
mood, skills, plans, purposes,
my misunderstandings or somebody's else beliefs, etc.
Can you develop a mod which could control permissions,
namely the permission of "Reply to a topic", for example,
only for those members listed by topic Author
in special control field
?
In my sample topics - i am listing predefined members' nicknames
in my topic titles or in my messages subtitles.
The better field could look like a field from Topic description mod,
i assume.