Since you already have quasi-root access, you probably can get away with just flashing a new recovery, to allow you to flash roms. But, instead of doing all of that work in FastRX8's post (which will work for you), why not just use the 3 click root method, by Jiqqaman? You will have full root, with your nand unlocked.
http://forum.xda-developers.com/showthread.php?t=706411