I think they should hang him a little at the time. First hang his left arm, then his right. Then move on to his legs before hanging him from the neck.
Oh, and let him see each of his limbs hanging from the other ropes before they hang him from the neck.
Normally hanging is a rather humane form of execution, as the neck snaps instantly once the body drops through the gallows. However it may be worth considering lowering Saddam down gradually so he is slowly strangled to death.
Regards, Ivan