MacOS – How to get the three finger ‘scroll to top’ back in mountain lion

I looked in System Preferences and didn't see any options for a three-finger swipe gesture. However, there are many applications that enable you to create custom gestures. Here are a couple (these two are both free):

1. Better Touch Tool

Here's a description from their download page:

BetterTouchTool adds many new, fully customizable gestures to Magic Mouse, Macbook Touchpad and now even the Magic Trackpad!

---

These gestures are customizable:

• three finger swipes (up/down/left/right)
• three finger tap
• three finger click

There are many other gestures that are customizable, but you seem like you want some sort of three finger gesture so I listed those.

1. MagicPrefs

Mac OS X-only: MagicPrefs lets you create custom gestures (and override existing ones) to provide new multitouch functionality to your Apple input devices. It's like the great Multiclutch, which serves a similar purpose, but with added power and precision that gives you serious control over even the nuances of your gestures.

You have five fingers and MagicPrefs recognizes that, letting you assign actions to taps and clicks based on the number of fingers present on the mouse. Additionally, it supports swiping, rotating, and pinching actions. You can make these actions do carry out tasks like zoom in and out of the screen, start Exposé or Dashboard, initiate Quicklook, and even run AppleScripts. If you find a gesture is too sensitive, or not sensitive enough, you can adjust that. You can even create presets for specific circumstances, so you can assign certain gestures for when you're working and others when you're gaming.