Contact Form 7 missing on_submit hook?

In the additional_settings section of each form, you can use on_sent_ok, but is there a similar on_failure, or even just an after_submission?

I’ve looked through the code, and in the scripts.js file there’s a section for “callbacks” using the onSentOk aspect of the response (refers to on_sent_okay from additional_settings, and another identical section for processing onSubmit (which was reported in v2.0.6 changelog). However, I can’t find any mention of onSubmit or on_submit in the rest of the code, and adding something like on_submit: alert('testing here'); does nothing.

Once I “manually” attach the setting to the ajax response with the following, it works.

Pastebin: http://wordpress.pastebin.ca/2158913

add_filter( 'wpcf7_ajax_json_echo', array(&$this, 'ajax_results_append') );
public function ajax_results_append($items, $results){
	global $wpcf7_contact_form;

	$items['onSubmit'] =     $wpcf7_contact_form->additional_setting( 'on_submit', false );

	// send it back because it's a filter
	return $items;
}

Is this a bug, or am I missing something?

http://ww.wp.xz.cn/extend/plugins/contact-form-7/