I'll give you a scenario:
A group of writers need a forum to collaborate on character creation and stories and etc. They want a forum in which they can put posts that need to be strictly formatted, like character designs, plot outlines, etc.
The best way to do this, in my opinion, would be to have the ability to replace the normal editor with forms the admin can create and customize. The OP would be restricted to this form but the replies for discussion would revert back to the normal editor for freeform text entering.
This could be useful for support forums, role-playing forums and many others.
Also, an additional feature to this would be to give the poster the ability to repeat certain fields (which were made repeatable by the admin) while writing the post, making it free flowing but still with specific formatting and organization.
Tell me if need to clarify anything.
