I know this is old, I'm sorry, but I'm interested in this! Found this thread (and the forum btw!..) on Google because of it. I'd like to change the defaults to Set mode and Off battle scene (animations).
I was thinking I needed to change something in the "engine/menus/options_menu" file, no?
I tried tinkering with the .ToggleOn/Off and .ToggleShift/Set options but to no avail... also tried to include these options in the default_options file as you said using like "1 << BATTLE_SCENE" for example (since, as far as I understand, 1 here means off, for both Battle Scene and Battle Style), also fail...
Thanks in advance!
Like Major Agnostic said, you should bitwise-or the options to wOptions (the first byte in default options). You can do it like this:
DefaultOptions:
; wOptions: med text speed
db TEXT_DELAY_MED | (1 << BATTLE_SHIFT) | (1 << BATTLE_SCENE)
...