Your saying all those like this is a thread to give more ammo.
They not getting more ammo. DOUBLE ammo and it will take DOUBLE slots. They will still have same amount of ammo, only difference is the they can carry melee weapon, 0 slot.
That's only true if they're already not carrying a melee weapon.
How many throwers can you think of that only carry throwing weapons? When I throw, I often bring three stacks of war darts and a one slot, one handed weapon. If this change was made, I would almost certainly carry two double stacks, a buckler, and a hammer or other zero slot weapon.
Not only would I have one-third more ammo, I would also have gained a shield!