Actually, FFXI would be less friendly to boxing. The reason is because FFXI doesn't have an invasive detection system like WoW does to keep players legit. Instead, Square-Enix uses a CSI type of detection method - they snoop on you in-game if they're alerted that you might be doing something against the ToS. Unfortunately, FFXI's ToS is even stricter than WoW's - SE has said many times that even Windower is not allowed, which is why everyone is so hush-hush about it in-game - everyone uses it, but everyone pretends they don't. Therefore, I don't know if you'd be legit with a software multiboxing solution for FFXI. As you would be very visible in-game I think you'd be found out very quickly. You might get by if you had a full hardware setup though, but you'd inevitably have to duke it out with the GM squad to try to convince them you're legit.

That said, if things changed to make it more friendly to boxing I'd love to play my own full party in that game. I'd never pay to play again, much less pay for 6 accounts; I think they should move to a free to play cash shop model.