Minimum Post
Plugin allows the administrator to set which forums require a minimum post number to be able to make a new thread or post which is defined in the settings.
http://mods.mybb.com/view/minimum-post
Cheers!
Works great.
However, it limits both replies and threads, if you want to just limit it to threads you can remove this part from the main PHP file:
$plugins->add_hook('newreply_do_newreply_start', 'minimumpost_invalidate');
$plugins->add_hook('newreply_start', 'minimumpost_invalidate');
Tried it and it seemed to work without any problems.
This plugin has been created about 50 times, do we really need another version of it ?