TemplateWizard can support customized inputs for different content types, to make it easier for the user to enter information and to prevent the user from entering inaccurate information in some cases (like with the datetime selector).
We're currently not doing anything special for the 'boolean' parameter type. It is defined as "a boolean value ('1' for true, '0' for false, '' for unknown)".
They should use a ButtonSelectWidget with Yes/No/Unknown (equating to 1/0/'') as options, e.g.:
(This ticket used to also cover multiline fields, but they've been moved to: T201378: Add multiline input fields for 'content' and 'unbalanced-wikitext' parameter types)