FFTPatcher "Job Levels" Table - Extra Slot (WotL)

[BleuVII]

I am fairly new to this scene, so I apologize if this has been asked before. When opening up a WotL patch in FFTPatcher, there is an extra row below Onion Knight that reads "Unknown". Does this map to a job slot? If so, does anyone know which slot? I have a vision for what I am trying to do, and it would be awesome to have one more slot to work with!