Hi, Pokooko you can control who is held in a queue when posting threads or replies in your ACP > Groups & permissions > User groups > user group you want to allow threads to be posted without Admin approval. (see attachment)
Admins
Registered User
change these setting for your user groups.
To show you: Groups & permissions > User groups > Edit user group: Administrative > Submit content without approval = YES
Groups & permissions > User groups > Edit user group: Registered > Submit content without approval = NO
Groups & permissions > User groups > Edit user group: Un-Registered > Submit content without approval = NO
Groups & permissions > User groups > Edit user group: BANNED > Submit content without approval = NO
you get the idea, Remember if you allow Registered users to post with out Admin approval they can post anything = SPAM or other Crap.
I am sure someone will correct me here, Why not make NEW user group named > Trusted User, VIP etc
Hope this helps and I have explained clearly