Hello, I've been wanting to modify the Japanese version and getting things to work with the English tools is a hassle. FFTpatcher has limited functionality, and I basically have to open the disc up with CDmage and do everything manually if I want to change the sprites. I think I've heard that some of the tools here were derived from Japanese ones, but I can't find anything like that. I'm wondering if anyone can point me in the right direction.
The JPTools were derived from the tools here, with IIRC the exception of FFTEVGRP
Look in site submission for the JPTool pack.