It would be handy to be able to control the speed text is printed during the say and ask functions using a config variable such as config.textSpeed. This variable could be the number of characters printed per second.
On a basic level, it's a nice quality of life feature and would allow players to select their preferred text speed in an options menu. For more creative uses, you could have characters in your game appear to talk faster or slower by changing the variable before the say or ask function call.
You could also have a config.textSkip variable which would give you even further control on how text displays. Currently the text typing animation is skipped when the player presses the A button. With config.textSkip you could override this behaviour by setting the value to 0 (the default value of 1 would keep the normal behaviour).