Gestr cydia tweak allows you to launch apps with multitouch gestures you define!
Gestr, first developed for Macs with multitouch trackpads, is a revolutionary user-defined gesture based launcher. Multitasking is fast and natural when the entry point to your apps is… anything you can draw!
Gestr has a small footprint – no app icon, and no settings menu. To use Gestr, simply assign an Activator trigger to it. Visit an app, trigger Gestr, tap “Assign,” and then draw to assign that gesture to that app. Otherwise trigger Gestr and just draw to have that gesture recognized and the appropriate app launched.
Choose Activator from Settings.