Structure of correct webform submit?

Notice: Undefined index: type i _webform_client_form_submit_flatten() (rad 3378 av sites/all/modules/contrib/webform/webform.module).
Notice: Undefined index: type i _webform_client_form_submit_flatten() (rad 3378 av sites/all/modules/contrib/webform/webform.module).
Notice: Undefined index: type i _webform_client_form_submit_process() (rad 3362 av sites/all/modules/contrib/webform/webform.module).
Notice: Undefined index: i webform_component_include() (rad 4605 av sites/all/modules/contrib/webform/webform.module).
Notice: Undefined index: type i webform_submission_data() (rad 26 av sites/all/modules/contrib/webform/includes/webform.submissions.inc).
Notice: Undefined index: type i webform_webform_submission_presave() (rad 1245 av sites/all/modules/contrib/webform/webform.module).

This issue https://www.drupal.org/node/1720034 seems to address my problem, but ends with "Closing as this looks like a damaged / modified webform. I'm not a fan of adding lots of defensive programming against damaged data structures that should never be damaged. It leads to unbounded code bloat." by DanChadwick. How do I find out the correct formatting of adding fields to a webform?

I need to add fields which are only used to perform actions in webform_submission_insert. That is I need them in the $submission variable of that function. I've managed to get everything working apart from the error messages above. As soon as I add 'type' as per first line of the error notice I loose the data from $submission.

<?php
function webform_createaccount_form_webform_client_form_alter(&$form, &$form_state, $form_id) {
	$nid = $form['#node']->vid;
	$num_fields = count($form['submitted']);
	$num_components = count($form['#node']->webform['components']);
	
	$num_fields++;
	$wca_field_one = array(
		'#title' => t('Name'),
		'#type' => 'textfield',
		'#description' => t('<i>Type your e-mail address here to register and receive a confirmation e-mail.</i>'),
		'#weight' => ($num_fields + 1),
		'#webform_component' => array(
			'nid' => $form['#node']->vid,
			'cid' => ($num_components+2),
			'pid' => 0,
			'type' => 'textfield',
			'form_key' => 'user_registration_name',
			'name' => t('User Registration Name'),
			'required' => 1,
			'weight' => 10,
			'page_num' => 1,
		),
	);
	$num_fields++;
	$wca_field_two = array(
		'#title' => t('Password'),
		'#type' => 'textfield',
		'#description' => t('<i>Type your e-mail address here to register and receive a confirmation e-mail.</i>'),
		'#weight' => ($num_fields + 1),
		'#webform_component' => array(
			'nid' => $form['#node']->vid,
			'cid' => ($num_components+3),
			'pid' => 0,
			'type' => 'textfield',
			'form_key' => 'user_registration_password',
			'name' => t('User Registration Password'),
			'required' => 1,
			'weight' => 11,
			'page_num' => 1,
		),
	);
	$num_fields++;
	$wca_field_three = array(
		'#title' => t('Your e-mail'),
		'#type' => 'textfield',
		'#description' => t('<i>Type your e-mail address here to register and receive a confirmation e-mail.</i>'),
		'#weight' => ($num_fields + 1),
		'#webform_component' => array(
			'nid' => $form['#node']->vid,
			'cid' => ($num_components+4),
			'pid' => 0,
			'type' => 'textfield',
			'form_key' => 'user_registration_email',
			'name' => t('User Registration E-mail'),
			'required' => 1,
			'weight' => 12,
			'page_num' => 1,
		),
	);
	$num_fields++;
	$wca_fieldset = array(
    '#title' => t('Log in or register to complete this form'), 
    '#type' => 'fieldset',
    '#description' => t('Not signed in? You need to <a href="/user">log in</a> or register to submit this form.'),
    '#weight' => $num_fields, 
    '#collapsible' => TRUE, 
    '#collapsed' => FALSE,
    '#webform_component' => array (
    	/* 'type' => 'fieldset', */
    	'nid' => $form['#node']->vid,
			'cid' => ($num_components+1),
			'pid' => 0,
			'form_key' => 'login_or_register',
			'name' => t('Login or register'),
			'required' => 1,
			'weight' => 10,
			'page_num' => 1,
			'children' => array(
				$wca_field_one['#webform_component'],
				$wca_field_two['#webform_component'],
				$wca_field_three['#webform_component'],
			), 
    ),
   );

	$wca_fields = $wca_fieldset;
	$wca_fields['user_name'] = $wca_field_one;
	$wca_fields['user_password'] = $wca_field_two;
	$wca_fields['user_email'] = $wca_field_three;

	$form['submitted']['login_or_register'] = $wca_fields;

	$form_state['webform']['component_tree']['children'][] = $wca_fieldset['#webform_component'];
	//$form_state['webform']['component_tree']['children'][] = $wca_field_one;
	//$form_state['webform']['component_tree']['children'][] = $wca_field_two;
	//$form_state['webform']['component_tree']['children'][] = $wca_field_three;
	
	$form['#node']->webform['components'][] = $wca_fieldset['#webform_component'];
	$form['#node']->webform['components'][] = $wca_field_one['#webform_component'];
	$form['#node']->webform['components'][] = $wca_field_two['#webform_component'];
	$form['#node']->webform['components'][] = $wca_field_three['#webform_component'];

}

I'm really stuck on trying to understand the correct structure. I would dearly love to surpress the error notices, because from a pragmatic stand point the code does what it should, need to do: It creates the temporary extra fields and brings the data over to webform_submission_insert $submission-variable.