Basically it's not so much about just G15s and such whatever keyboards that happen to have a display integrated to them.
Were this information available for use to create these LCD-applets, it would mean that other external applications would be able to use the data as well without them being 'cheats', since the information would be available (or OK to be used).
You could have a larger display than what keyboards usually do, and send the information there. There are lots of displays available that are intended for use in cars and such, which already tend to be quite a lot larger than those in keyboards. Basically the same thing as sending the information to another display, but to one that is not quite as large and not intended to be used as a main display of a computer.
Such would be able to display for example a map quite well.
Olor,
As one of those who edit the wikkis, I am sorry that they are quite a lot out of date nowadays. I mainly edit at the Gamer Escape nowadays, which obviously has even less users than FFXIclopedia does now, but in the end, it's all about man/woman power as well as motivation and time to make them up-to-date. ^^;