IMO something like a recycle bin for delete posts would be a better solution. This could be used for other features, too.
BTW: IMO the aim should be to prevent spam and not to manage spam.
That's because this can be a MOD. Different people like to manage these kinds of things differently.
Some prefer to kill spam (like moi and you) others like to manage it and, sometimes, let people have spam in his board. Depends on the policy of the board.