I would love to find a wall charger like I had for my Incredible and my Rezound for the S3. Simply put it plugged into the wall and had a slot on it to insert a battery, either standard or extended and also a cable to plug into your phone. So what it allowed me to do is to charge my standard battery and my extended battery (in the phone) charging at the same time.
Any ideas would be appreciated. I like to carry the standard battery along with me when I go on overnite trips just in case I forget to charge the phone at nite. I then have the standard battery along to fall back on.