When surfing the web in Safari, you can double-tap the status bar to quickly scroll back up to the top any webpage. In other iOS apps that have the shortcut enabled, you can get the job done even faster by tapping the status bar only once. The only bad thing about this feature is that there's no shortcut for scrolling all of the way back down or to the middle.
Fortunately, there is a way to create your own shortcut gesture that will make reaching the middle and bottom of a page just as easy as reaching the top. For this to work, you will need to have a jailbroken iOS device.
Enter the your iPhone's Settings app and select TapToScroll's preferences. Once there, tap one of the actions and select an Activator assignment for it. To keep things consistent, I stuck with actions in the status bar.
You'll need to redefine the "Scroll to Top" gesture again, though, because this tweak will disable it. You can always make it a double-tap for familiarity.
With your actions chosen, enjoy scrolling any page even faster that you could before. Not only can you get to the top super fast, now you can get to the middle or the bottom of a page at the same speed.