iPhone, iPod touch and iPad users invariably go through the jailbreak process on their devices for a variety of different reasons. Some want to alter the aesthetics of the operation system. Some want to introduce additional gestures to navigate through the operating system. Some just want to see what's available on Cydia and enjoy the freedom to choose how their device operates. It's unlikely that a large portion of those who have jailbreaked have done so purely to flick between home pages at the tap of an icon, but for those interested in that sort of functionality then the new PageJumps package should scratch that itch.
