Seeing as Offtopic can be easily abused, and it is very hard to have a sophisticated, mature discussion over there, I think a new board would be in order; Mature Discussion.
The general idea, of course, would be a more mature overall feeling to it.
No:
-Spam
-Flaming (Directly, for example: forget you, as compared to, "True, but I disagree.")
-No modify button
Simple as that.
But it's not up to me, obviously. Hopefully this gets considered.
(Edited for another thing I forgot)