It probably will be Sora vs. Xehanort within kingdom hearts - but, Xehanort will probably have done something with the 13 darknesses (i.e. absorbed them to form some perfect being of darkness?) Sora will have to face this alone, probably wanting to save the other 6 'lights'.
I'm no expert when it comes to coding, but i would assume that even if you mod the status/neostatus of any character to another it would not affect the character's coded AI, which is made specifically for them to target sora/the player's character
But then again, i really wouldn't know..
Sorry im not much help :S
Unless those Music Files (KH1/KHFM) are already in KH2FM then i doubt that there would be a code for them; you would actually have to modify the entire game yourself and insert those sound files, which i still doubt would work..
But, you should be able to get a Music Modifier Code for KH2 Music since it is all already in the game..
EDIT: That's correct, the Music Modifier code is in the attachments on the first page :)
Thats probably more along the right lines...haha
If i had a working hex editor i'd try and check out what category they come under but i just dont have the time :S
I dont think there would be as the magic in the game is not technically in item form; When you unlock them it seems as if they are key items but i wouldn't think so as they don't show up in the stock items in-game..
Ahh, the All Bottle Items code doesnt actually give any magic to me at all; it only gives the bottle items ie. Potions, Ethers, Elixirs, Ap Boost, Power Boost, Defense Boost, Magic Boost etc..
Really? haha, when i activate inf. form; my form gauge goes down; but when it hits zero or i revert back; i still have max drive..
Inf. Drive has the opposite effect; my form gauge doesnt decrease, but when i revert, my drive gauges have been used...