yes there is, answering myself:
override main function, put following code in qa-theme.php:
function main() {
$content=$this->content;
// HERE goes the extra HTML
$this->output('<p>Test</p>');
$this->output('<DIV CLASS="qa-main'.(@$this->content['hidden'] ? ' qa-main-hidden' : '').'">');
$this->widgets('main', 'top');
$this->page_title_error();
$this->widgets('main', 'high');
$this->main_parts($content);
$this->widgets('main', 'low');
$this->page_links();
$this->suggest_next();
$this->widgets('main', 'bottom');
$this->output('</DIV> <!-- END qa-main -->', '');
}
Hope that is helpful for others ;)