It's not going to happen. The reason is that although code may be there, on the PC the advanced configuration menu is different window that runs outside both PoL and FFXI and is used to establish the startup parameters of the game. That is not an option with the way the 360 is designed. So no it's not just 30 seconds of code. You're rewriting the way the entire menu system functions in order to accommodate an advanced start up menu. It's not that it's not possible, it's just not feasible with how the 360 works.

Even the PC versions of PoL and FFXI don't have the advanced configuration menu built directly into them.