When you depress the Home button it feels like your clicking the whole button of the screen right? It's because you're holding the iPhone. - you're feeling the vibration everywhere in your hands, it's no longer just your thumb With the MacBook trackpad, it feels like a real click (because it's only your fingers), well if you put your iPhone on a solid surface, it feels like a real click as well. Change the Home button setting to 3. Try it out.