As of title, is there any way to customize the quick settings grid available in Android 4.2 ? This feature has potential, but in most cases it does not take advantage of the screen size.

As of title, is there any way to customize the quick settings grid available in Android 4.2 ? This feature has potential, but in most cases it does not take advantage of the screen size.

Currently I can only find customization options through mods or other updates to the ROM. For example: http://forum.xda-developers.com/showthread.php?t=1999125
It would really be great if stock Android 4.2 would provide functionality to add tiles, re-order tiles or change the function of long/short taps on tiles. This issue has some of those feature enhancement requests: http://code.google.com/p/android/issues/detail?id=40285
This can be done in Android 4.1.2 especially in Samsung Galaxy Note 2. Settings-> Display-> Notification Panel. Then drag and adjust required combinations.
If there's still anyone interested in getting the answer, the best I know is by using Notification Toggle by j4velin. It can be customized to display toggles(Wi-Fi, Bluetooth, etc) or to launch apps.
My stock Android 4.2 and 4.4 devices doesn't allow Quick Settings customization. To customize it, I had to settle with Gravitybox [JB] which needs Xposed Framework and root access.
My initial stock Quick Settings were more or less similar to the one you posted. After my favorite tweaks it looks like (see an app's icon too):
The usage is simple. You install, activate, launch this app → Statusbar tweaks → QuickSettings management and do the tweaks as per your needs.
And don't worry regarding it's description related to Mediatek devices only. It works on Qualcomm ones as well.