* refer to http://xaviesteve.com/disable-multitasking-in-ios4-no-jailbreaking-needed/ Simply change the property of multitasking as false in /System/Library/CoreServices/SpringBoard.app/NxxAP.plist. The reference web page shows N82AP.plist, but currently it’s N88AP.plist. I didn’t look further, but I could guess its name would be changed in time. Using ssh/scp, you can copy it from/to Mac and manipulate it.
1. Making five items in Docks -> “Five Icon Dock” via Cydia 2. Making five multi tasking icons -> “Five Icon Switcher” via Cydia 3. Making five columns or more -> “Iconoclasm” via Cydia.