Someone find Deathlike2.

I apologize for not responding directly to your request. Just had a couple of comments...

I'm not sure I understand the nature of the hack. Are you porting a hack from another version of the game to FF4A? (I was a little confused, because you linked to a thread about the DS version)

Also, I really hope you plan to fix the game's numerous bugs. At the very least, consider using the European or Japanese revised version, since they addressed some of the problems.

Ah, okay. That answers my question.

Well, I'll be looking forward to this one!

I got some slightly not so good news for the Chest data.  As it turns out, the game does not use specific co-ordinates to keep track of the locations on the map for any of the chests.  Basically, chest tiles(or tiles set up to contain items) are placed on the map(which is compressed).  Then the data reads each tile, and adds the contents.  That means that the first chest tile located will contain the first item in the list.  The good news is that it means that all you need to do is edit the map accordingly, and not fool around with co-ordinates.  The bad news is that the map is compressed.

I also found event scripts, and they use relative pointers.  I haven't played with this game for a few years, so unfortunately I don't remember alot of the stuff I've found.