Hi, I have a few questions regarding the PSX version of the game and this software.
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1. Check the source code for sector indexes or clone the source code, compile it in debug mode and make a breakpoint on addresses
2. No, that's totally not right. It works completely differently. PSX disc sector works on completely other structures than Windows NTFS/FAT32 file system. For LZSS-> it's possible to unpack LZSS manually. Check unLZS tool here in tools section. As for dumping sectors you have to go on your own with HEX editor. Putting everything back is doable as far as you don't exceed the sector count and make sure to NULLify all data up to next sector that is used for something else (so if you dump 5 sectors you have to reinput maximum 5 sectors. If smaller then fill remaining with 00). This is also the same as translating SNES games where everything you could do was to work with HEX editor and do everything manually
3. It can, but that's a huge amount of work with possibility of breaking everything easily. PSX and PC files are not the same. They don't have FL/FI/FS files.
However it's all possible-> for reference see balamb.pl -> they released tools for PSX translations, but as you might have guessed it's hard even to work with the tools and some don't even come up with pre-compiled binaries. Have fun!