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Why I don't see any extra options on the comment submission form?

It's probably because your theme doesn't have the 'comment_form' hook. I use this hook to automatically insert a menu to select which commenters you are replying to. If it's the problem, just an extra template tag. Open your theme file (usually comments.php) And insert the following template tag: <?php commentmailer_form(); ?> between the <form> and </form> tags.