um in
VII
maybe to have the whole Tifa-Aeris-Cloud thing properly resolved.
Wutai and yuffie to have been involved more.
Vincent and Yuffie proper main characters
Cid and Shera? maybe a bit at the end with that.

VIII
I agree i'd have liked to see some of Siefer and Rinoa interaction.
Stupid "(SPOILER)Oh i love squall like a brother" bull not to have been put in and to have some proper Quistis angst
More Irvine involvement

IX
hmm not much to say its pretty much all done and dusted

X
Yuna to have put up and shut up with her (SPOILER)marriage to Seymour maybe.

XII
Ashe to have gone to (SPOILER)Rozaria with Al Cid
Rasler's (SPOILER)ghost to actually be real so that when she stabbed him it would be more dramatic
more Ezla and Rikken (i liked them)
Ashe's (SPOILER)coronation
undecided on this but maybe to see (SPOILER)Balthier and (SPOILER)Fran alive and well at the end. But saying that i like how the last time they are seen Its with (SPOILER)Balthier walking out of a firery death trap carrying the lovely Fran like a princess and with him looking every bit the hero