Hmm, from what I understand, it looks something like this: Community has asked for this functionality years ago, SE replied "No" and "PS2 Limitations" so community went ahead and fixed the problem for themselves and doesn't bother asking SE more for basic functionality.
It doesn't look like you'll get any help from SE about IME any soon, deal with itSame goes for other things, like enhanced graphics, better macros, not losing focus on players/mobs when blinking, more autotranslate phrases (hell, even for zone, spell and job ability names), etc. For all of these aforementioned issues SE has already said "No" numerous times, even on these forums.
Sorry to destroy your hopes.