09-06-2015, 10:50 PM
You should be able to expand your rom in the FF3us Multi Editor, there's a button to expand it in the main window. That will give you more space for dialogue.
You should know that there are already a couple hacks like this, though.
http://www.romhacking.net/hacks/1386/ - A "decensor" hack that expands dialogue.
http://www.romhacking.net/hacks/2247/ - A more recent hack that changes the script to be more like the GBA version.
I'm afraid that there won't be much demand for your version because of these.
You should know that there are already a couple hacks like this, though.
http://www.romhacking.net/hacks/1386/ - A "decensor" hack that expands dialogue.
http://www.romhacking.net/hacks/2247/ - A more recent hack that changes the script to be more like the GBA version.
I'm afraid that there won't be much demand for your version because of these.