[Plugin: Contact Form 7] Populate listbox with post-titles

I’ve been looking all over the place for a way to populate a listbox with post-titles from a certain category. Various hacks, do populate a listbox, but don’t send the actual selected value or mess up all other listboxes.
I found this hack for the select.php module:

1.
In function wpcf7_select_shortcode_handler, $values, $labels and $defaults need to be redefined for your customised dropdown. They are arrays for dropdown values, dropdown texts and default selection respectively. I have the following snippet right after $options are parsed (after line 50). Here my select field ID is “position”.

if ($name == 'position') {
  // query the positions
  $positions = new WP_Query('YOUR_QUERY');

  while( $positions->have_posts() ) : $positions->the_post();
    array_push( $values, get_the_ID() );     // post ID as option value
    array_push( $labels, get_the_title() );  // post title as option text
  endwhile;

  // set the key of the default selection
  array_push( $defaults, 1 + array_search($YOUR_DEFAULT_VALUE, $values) );
}

2.
In function wpcf7_select_validation_filter, you need to re-fill the dropdown option values before the post operation because they cannot be found in the shortcode. They will be needed in $_POST later. I have the following snippet right after the local variable definitions. The code is very similar.

if ($name == 'position') {
  // query the positions
  $positions = new WP_Query('YOUR_QUERY');
  while( $positions->have_posts() ) : $positions->the_post();
    array_push( $values, get_the_ID() );
  endwhile;
}

It works and does populate the listbox with my post-titles, but emails me the post-ID.
I can’t figure out what to change to get the titles in the email instead of the ID.

Can anybody help me with this?
Thanx in advance!