cRefillAmmo is a very (~5kb) small Stand-Alone AddOn.
It's meant for hunters who are tired of spam-click-buying ammo.

When you go to a merchant and this merchant sells your currently equipped ammo, cRefillAmmo automaticly refills your ammobag with this ammo.

You can choose between completly automatic or a confirmation dialoge.
The config is found in the lua file.

FAQ:
Q: Why does it take so long to refill my ammobag?
A: This is a WoW issue and only happens if you fill alot of slots. If you buy many items very quick, it takes several seconds to get a positive response from the server.

Q: How do I change the ammo cRefillAmmo buys?
A: cRefillAmmo buys the ammo you currently have equipt. Just equip another ammo type and it will refill that instead.

I'm from germany, so please don't mind my mistakes ;)