Enable/Activate Multitasking Gestures
By Since iOS 4.3, Apple introduced multitasking gestures also known as multitouch gestures to Apple’s iDevices including iPhone, iPad, and iPod touch. The multitasking gestures was seen on earlier iOS 4.3 build, purposed for developer only. This multitouch gestures also hidden feature by default.
There are several ways to enable or activate the multitasking gestures option on iOS 4.3.x (includes iOS 4.3, iOS 4.3.1).
1. Using custom firmware build by sn0wbreeze.
2. Edit .plist file in manually.
3. Install MT Gestures app from Cydia. This app only supports iPhone 4 and iPod touch 4th Generation.
Cydia 
