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Go to the PScreen_Options script, and in def initialize change the value of @textinput from 0 to 1. It is on the line 30-something by default. This will preset the default input mode, but it will only work if there is no save file. Because otherwise, game reads data about options from a savefile, I suppose.
For disabling player from changing it, just comment the fragment of code from line 525-something to line 530-something in the same script. This also will make this option disappear from options menu.
These bits