While unrelated itself with applications, easy access to your settings for Wi-Fi, Bluetooth, GPS and Silence are probably the best features to add in your notification panel. However, this is another area where you can customize what you need more settings. For this to occur, go to Settings> Device> Notification panel. For more viejitas Android versions you'll find these options in Settings> My Device> Display> Notification panel.
Even if you manage to make a couple of changes suggested above, it is likely to notice a difference.