The iPhone dock is a very useful feature allowing you to access your favorite four items on the phone at the touch of a button. The standard setup allows you to have four icons on the bottom of the home screen; however, if you feel the need for one more shortcut, it is possible to add a fifth button to this. This takes less than five minutes and anybody remotely competent at using an iPhone can do it.
Along the dock of the iPhone, iPod touch, and iPad, the default icons are Phone (iPhone), Mail, Safari, and iPod. In order to add room for one more icon all you have to do is install the ‘Five Icon Dock’ tweak via Cydia.
Cydia is a small third-party application that lets one customize a lot if not everything on an iOS device. Once you install the application, it will enable you to have five icons along your dock. It’s very useful if you want to minimize the amount of time it takes you to search for an application. For instance, you’re driving and you would like to quickly open an application, you will be able to do exactly that in less than a few seconds!
Below are a few screen-shots of the ‘five icon dock’ and Cydia application developed by Jay Freeman.