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Keyboard settings are very, very limited, only thing Windows offers is the option to use CTRL/ALT/SHIFT + key in sequences rather than simultaneously and to slow down or disable the repeat rate of keys and filter out repeated keystrokes, that's for people with disabilities using an actual keyboard though.
I would contact the makers of whatever input device your friend is using, if you have not done so. They are the people most able to help and offer solutions.
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