The spiked mace would not do any additional melee damage, it would just look cool.
It would do the same damage as swords and deteriorate just as quickly, but if you right clicked you could throw it, about a quarter of the arrow's range. You could pick it up off the ground and throwing it would do double the damage to the durability that a normal attack would. Spiked maces would do one extra damage when thrown.
Perhaps, for the thrown nunchuck idea, if it hits a block, it transforms to the dropped item (if you get what i mean, i had trouble explaining that). That would be similar to thrown eggs spawning chickens, so you replace the eggs with the nunchuck, and the chicken with the dropped item.
by this, do you mean that if I throw a nunchuck at a creeper, the nunchuck would become 1-2 sulphurs?
also, in the first recipe, would the diamond be replaced by whatever item the tool will be(planks, cobble, iron, gold, diamond)?
and the third recipe, that looks like a good battle axe idea.
Regular Mace: Same damage as sword, but right-clicking will break a targeted block instantly if not bedrock (some circumstances apply). Slower attack time.
  = Mace Head
Flail: Same damage as a sword. Slower attack time. Right-click to throw it; will slow down a target.
 [>>-i>]  [>>-i>] = String
Nunchucks: Same damage as a sword. Quicker attack time. Smaller durability.
 [>>-i>]  = Stick, Iron Ingot
And just for kicks and giggles.
Throwing/Skinning Knives: Left-clicking on an animal will give you max drop + 1 of the animal & kill the animal. Right-clicking will throw the knife, causing same damage and you will be able to pick it up again.
  
  = Iron ingot
Mace (the pepper spray kind): Right-clicking within a short distance of an entity will blind it causing it to stop attacking and panic.
Here's another idea for maces: Since blunt damage is more likely to be more effective against skeletons, maybe you should make maces do normal damage to other mobs, but double damage to skeletons and spider jockeys?
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Big props to greybacon for the Mewtwo skin used in this image!