Would like to have an app that would allow me to answer calls directly to speaker using any of the existing buttons. Right now to answer a call one has to swipe the lock screen to answer the call then press speaker icon. It sure would be nice to avoid all this while driving. Instead one simple button press would be preferred while driving. I really don't care which button. However the home button is my preference. My iPhone is a 4 running a jailbroken iOS 4.3.1.