I think I can speak for myself, pinkpuff and the rest of the fans of Cecil and Golbez that we need a more exclusive and easy to use Hacking tool for Final Fantasy IV, why should the Final Fantasy VI people get all the fun?
It's called FF4kster.

But seriously, I'd be amazed if you could find a game that has an editor that is the equivalent of RPG-Maker-That-Doesn't-Suck than FF4 at this point. It's an amazing, virtually bug-free tool (I haven't had any problems since the namingway-screen issue was fixed :D ). You just have to keep backups (of your project) and play around with it and learn it's setup.
First off and this is the most, I wanna make a Final Fantasy IV hack that is the sequel to Pinkpuff's Unprecedented Crisis game....one of the best Rom Hacks of the game ever.
I've been meaning for quite some time to play through this, as I've heard many good things. Same goes for Chillyfeez's TFW (as I keep starting to play through it, then getting sidetracked by my own project until I'm burned out on FF4 for a short period, then rinse and repeat lol.)
Those of us who love Final Fantasy IV are at the mercy of Tile Layer tools and have to learn offsets and do guess work with the colors without an undo button so we get less than detailed "New" sprites for things.
Use YYCHR. It has tile arrangement patterns to help see graphics better (and you can edit in your own), it has and undo/copy/paste functions, and can load up palette data by using ZSNES save states. Also there's no need for a Tile Arranger when it comes to YYCHR, as you can easily have a second instance of YYCHR loaded up with a blank rom and just do your editing there.
Also, my graphics thread has a txt file on the first page that lists the offsets of all the graphics I've come across (and a few that others have come across). I believe I also have a zip file with numerous ZSNES save states with (I believe) all the in battle character palettes, most of thier out-of-battle palettes, and a majority of the other stuff.
I put them there for just this purpose - so no one has to fumble around doing guesswork like I did when editing DK Cecil's NPC and Battle sprites back when I used Tile Layer Pro. Trust me, once you're using YYCHR and the things from that thread, it'll make things some a LOT easier then you'd think.