Gestr is a brand new jailbreak tweak that allows users to assign gestures to a specific app and launch the app using the assigned gesture. The tweak, which is available for $0.99 on Cydia's BigBoss repo, uses an Activator action to engage the screen used for inputing gestures.
In the end, Gestr probably isn't a tweak that will significantly speed up app launches on iOS, but it's undoubtedly a cool way to do so. Have a look inside for our video walkthrough, which showcases how it works.