These rules are hereby designated as Open Game Content via the Open Game Licence.
Battle axe short Dagger short Flail long Hand axe short Lance long Mace short Morning star short Pole arm long Short sword short Spear long Staff long/short Sword short Two-handed sword long War hammer short
You might disagree about some of those, but these are the ones I'd use. Even if they all only do 1d6 damage, this rule will add some tactical chrome to it game experience. Have fun with it!