In qa-theme.php i use :
// Adapt post metas
function post_meta_who($post, $class) {
if (isset($post['who']['points']))
unset($post['who']['points']);
parent::post_meta_who($post, $class);
}
In qa-styles.css i use :
.qa-top-users-score {display:none;}
You probably need more in the qa-styles.css, just use 'display:none' for any point-displaying elements. It should be possible to do everything in qa-theme.php, but this works good.