[Andreas]

There are Hooks

Try

newthread_post_start

PHP Code:

$vbulletin->input->clean_array_gpc('p', array('field1' => TYPE_STR, 'field2', TYPE_STR));
$newpost['field1'] =& $vbulletin->GPC['field1'];
$newpost['field2'] =& $vbulletin->GPC['field2']; 


threadfpdata_start

PHP Code:

$this->validfields['field1'] = array(TYPE_STR, REQ_NO);
$this->validfields['field2'] = array(TYPE_STR, REQ_NO); 


newpost_process

PHP Code:

if ($type == 'thread)
{
    $dataman->setr('field1', $post['field1']);
    $dataman->setr('field2', $post['field2']);
}