Sets the value governing whether the comment form is on its own page.
boolean $enabled: TRUE if the comment form should be displayed on the same page as the comments; FALSE if it should be displayed on its own page.
function setCommentForm($enabled) {
$this
->setCommentSettings('comment_form_location', $enabled ? COMMENT_FORM_BELOW : COMMENT_FORM_SEPARATE_PAGE, 'Comment controls ' . ($enabled ? 'enabled' : 'disabled') . '.');
}