Hi this a little addon y found in Todo Mod´s
What does this addon.
It obligues a just registert user, or a user who has never posted, to post first in an Admin defined Forum ( Presentation Forum). The Users are not able to post somewhere else if they haven´t done this step before. It redirects them directly.
2nd addon.
The Admin can define a minimum number of caracters per post. So users cannot post just blabla , they´ve got to write a hole sentence to complete the post.