Allowing an edit feature, even if it only gave you a five minute window to edit, might be nice, also. It sucks to realize you made a typo one second after you click reply, while realize you're going to have to reply again with a "* -----" correction, or prepare for the insufferable grammar and spelling-correction outcasts who cannot help themselves.
Allowing private messages might be good, too. For example, there are people on here that do coaching, or are looking for coaching. It might be nice to be able to exchange contact info without that being seen by some of the severely disturbed trolls that lurk here.