Nope. Not without root and the "23 toggles" mod

 

I use wanam lite in my signature. It has an option to use 23 toggles mod as you install it.

There's also a good multi window mod that allows almost all apps to work with multi window


http://forum.xda-developers.com/showthread.php?t=1995697

These are all for the i9300 though. International s3

 

Pretty much, most of the touchwiz based custom ROMs allow you to customize the notification bar by using mods. The one suggested by SUroot is one of them. You can also flash Omega or crDroid. As of now, I am using the latter. By the way, whether you want to root or not it's up to you, personally a wouldn't enjoy the phone without root, the decision is yours.

The above refers to the I9300.