A new Cydia Tweak called LockGestures is now available in Cydia Store. This tweak adds gesture-based shortcuts to your lockscreen so that you can perform certain tasks without even unlocking your device. With LockGestures tweak for iPhone, iPad, and iPod touch you can change the brightness of your device, launch an application, reboot, respring, or power off your device with simple gestures or taps.
LockGestures tweak for iPhone, iPod touch, and iPad is available for jailbroken iOS Devices in the Cydia Store for $1 under BigBoss Repo.