rSBT is built in to the newest Customize.app (I believe version 1.13 is the newest Customize for 1.1.1). I'm using it now, but I will forwarn you it's still a little buggy. I've found that the icon ordering on the first page of apps will be correct, however if you try to order icons on the second page they don't always go in order. It's a bug that rSBT is aware of and is trying to fix it.
Also in general Customize will freeze occasionally on the 1.1.1 firmware. Or at least it has a couple times for me. I had to reboot my phone and the changes were applied.