I've always thought the double side lance (and this weapon alone) should have a fifth attack direction; a stab behind you.
I have always imagined it would allow you to (minimally) damage someone behind you when you draw back for a normal forwards attack. Instead of you know, preparing for an imminent glance. Just imagine... hoplites could have some small hope when mobbed!
But I agree with malaclypse... every polearm would then need some sort of dual-stab attack since all have either a pointy end or blunt end. well, even if the end did cut it could still work. *looks at long axe's actual stab*
Please buff long axe stab.