Also, it does not work like that. The set of posts deleted will grow, not shrink, if you add more supermods.
Not necessarily. Since threads can be reopened and posts can now by undeleted, another supermod could decrease the number of deleted posts and closed threads by reversing moderation decisions (As Kai and Aftershock did to each other).
-Don't close an entire thread if a few posts need to be deleted or modified
-More strict punishments for the flaming. I've seen flame wars that last a long time, and moderation allows it to continue, yet a silly thread is pwned immedietly