Hi there,
Sorry for confusion caused.
If you wanted to add another check boxes, it will required you to do quite a modification in order to achieve this. To modify them, you can add them accordingly on listed files below.
Theme files
.../components/com_komento/themes/wireframe/form/default.php
Core files
.../administrator/components/com_komento/includes/komento.php
For your informations, we can do template override for out theme files as you can refer here
https://stackideas.com/docs/komento/administrators/customization/theme-overriding but not our core files. If you done some changes on the core files, it would be best if you can do backup on that files and replace them on your next Komento's update/upgrade.
Or maybe you can try to use Recaptcha instead as you can see here
https://screencast.com/t/LOlD2edQ. Please give it a try and see how it goes.