FE6 how to change default textspeed?

Changing the default textspeed is important to me since I want to make the tutorial less of a slog(It disallows skipping and that makes the text unbearably slow since it is only explanations).

For FE8, there is a patch that changes game options from the event script.
In the case of FE6 and FE7, I think you need to make a patch myself.