Developer Mode option is a cool settings page where you can do different things with your phone like force GPU rendering, show touches, pointer location and screen updates and you can also change Animation Transition Scale. This option is disabled by default on Android 4.2.2 and enabling it is a piece of cake.

Just go to Settings > About Device and tap the build number 7 times repeatedly and a sign will appear telling you that Developer Mode has been activated
That’s it. Now you are a developer.