I know I can enable it with xCode, but I have no disk space on my Macbook Air to install xCode.
Finally I found this article:
1. Run iTunes, connect your iPad to computer, right click your iPad name in left window of iTunes and select Back Up.
2. After the backup process done, exit iTunes, run iBackupBot, select the newest backup of your iPad in left window of iBackupBot.
3. Double click Library/Preferences/com.apple.springboard.plist in right window of iBackupBot, it will pop up a plist editor window.
4. Add below two line under <dict> line:
<key>SBUseSystemGestures</key>
<true/>
5. Click the Disk button to save changes then close the plist editor window.
Notice: When saving changes, the program will re-sort the contents of plist file by key, so the 2 lines you just added may been moved to other place, you can press CTRL+F and enter SBUseSystemGestures to find it.
6. Press CTRL+T, the program will prompt “Do you really want restore this backup to your device?”, just click Yes button.
7. After the restore process done, your iPad will restart automatically, then you can enjoy the multi-touch gestures feature.
BTW: this method will not show the multi-touch gestures switch in option window of iPad, so if you want disable multi-touch gestures feature, you can find and delete the two line that you added in Library/Preferences/com.apple.springboard.plist then restore to iPad using iBackupBot.
I try it on Windows 7 and successed enable gestures of my iPad (iOS 4.3 8F190)
The method request a shareware named iBackupBot, but you no need buy it, just click Cancel button when it prompt you to register it.
Finally I found this article:
1. Run iTunes, connect your iPad to computer, right click your iPad name in left window of iTunes and select Back Up.
2. After the backup process done, exit iTunes, run iBackupBot, select the newest backup of your iPad in left window of iBackupBot.
3. Double click Library/Preferences/com.apple.springboard.plist in right window of iBackupBot, it will pop up a plist editor window.
4. Add below two line under <dict> line:
<key>SBUseSystemGestures</key>
<true/>
5. Click the Disk button to save changes then close the plist editor window.
Notice: When saving changes, the program will re-sort the contents of plist file by key, so the 2 lines you just added may been moved to other place, you can press CTRL+F and enter SBUseSystemGestures to find it.
6. Press CTRL+T, the program will prompt “Do you really want restore this backup to your device?”, just click Yes button.
7. After the restore process done, your iPad will restart automatically, then you can enjoy the multi-touch gestures feature.
BTW: this method will not show the multi-touch gestures switch in option window of iPad, so if you want disable multi-touch gestures feature, you can find and delete the two line that you added in Library/Preferences/com.apple.springboard.plist then restore to iPad using iBackupBot.
I try it on Windows 7 and successed enable gestures of my iPad (iOS 4.3 8F190)
The method request a shareware named iBackupBot, but you no need buy it, just click Cancel button when it prompt you to register it.