Unhappy [Q] Customize stock settings.apk

Walton Primo c2, Prime 350D, Lava 352e

Hi guys!!

I need help urs help!!!

I want to add some customizable extra feature like
many famous roms like pacman, c-rom, cyanogenmod,
and so many others in stock settings.apk

How can i do that?
Is there any thread about that in xda??

these phones are running on 4.2.2
and mediatek 6572.