[quote=@UltikanaRe]
I mean GMs for their own threads, not for other people's.
[/quote]

[quote=@UltikanaRe]
True, but I do not think closing a thread would be terrible idea. Also, perhaps there is a way to move closed threads to the back automatically.
[/quote]

I understand that, but do consider that having control over the ability to post entirely reaches the realm of moderator capability, and could be too powerful for a GM. What if he wishes to lock one player out simply because he does not like them? It's an easy system to abuse.