>>31374218It looks like they were going to include it in the options at some point. Maybe they even implemented it and it somehow went unused? I don't know.
I looked at the names in the code.bin of the game and found these. I don't know if this could be useful and I don't even know if it actually works as it is (if it didn't it would kind of explain why it isn't in the final game though).
I tried editing the save file, changing the value I assumed could be the text speed (0x37C9 in game_system), which was already set to 04. I changed it to 00 and 14, but I haven't noticed any difference.