In the new KitKat there is immersive full screen mode that can be used like this:
To provide your app with a layout that fills the entire screen, the new SYSTEM_UI_FLAG_IMMERSIVE flag for setSystemUiVisibility() (when combined with SYSTEM_UI_FLAG_HIDE_NAVIGATION) enables a new immersive full-screen mode.
http://developer.android.com/about/versions/android-4.4.html#UI
I'm wondering if it is possible to set this mode for an Activity or full application in the manifest?