Stock ROM always had only five Quick Settings, not customizable. If you had customizable Quick Settings before, you were using a custom SystemUI. Right now, to get customizable Quick Settings in 4.3 firmware you can use either Xperia T2 Ultra dual or Xperia M2 dual SystemUI (ports are available in Themes and Apps subforum)...
Sony Xperia M dual [C2004]
ROM: 15.5.A.1.5 (stock)
Android version: 4.3 (rooted)
Bootloader: locked (unlockable)