Tap Tap Tap Blog: “Unfortunately, Apple decided to reject it. This doesn’t come as a complete surprise since it wasn’t our first time being rejected for that very feature. Their exact reason for the rejection is the following:”
Darn. I’ve been trying to convince my wife she needs this application. I thought I could sale her on the update because using the volume keys to snap a picture makes taking a picture more like using a camera. It’s a nice feature.