The QuickLaunch settings screen is inaccessible in Android 4.1+.
Nonetheless, the QuickLaunch keys are still active -- if you plug in a Bluetooth keyboard, you can use them just fine.
This allows you to access the QuickLaunch settings screen in Android 4.1+.
- install QCustomShortcut
(alternatives that might work: Manual Intent Shortcuts, ...)
- create a custom shortcut with these fields: