Allow synonyms for "yes" and "no" to be understood. E.g. "Yup", "Nope", or "Nah".
Just to clarify Dramus, are you using "Boolean" entity type in the question node, or just the regular "Multiple choices" with Yes/No options manually typed in? If it's the latter, you can already add synonyms by Clicking the "..." button at the top-right corner of the node -> Options for users -> then, add synonyms from there.
Let me know if this works.
We're going to gradually expand the prebuilt synonyms for the boolean entity type as well, if you choose to go that route.