I originally started this question in another thread, but that thread was sorta, kinda answered, and now I primarily want to know how to specify another form action... I tried using the code below, but the form action, when output, remains unchanged, although looking at the print_r($form), it's correctly changed... Why isn't it picking up?

function mytheme_user_profile_form($form) {
        global $user;
        $uid = $user->uid;
        //print '<pre>'; print_r($form); print '</pre>';
    $category = $form['_category']['#value'];

    switch($category) {
            case 'account':
                $form['#action'] = '/user/'.$uid.'/edit?destination=user/'.$uid;
                        break;
        case 'education':
                        $form['#action'] = '/user/'.$uid.'/edit/education?destination=user/'.$uid;
                        break;
        case 'experience':
                        $form['#action'] = '/user/'.$uid.'/edit/experience?destination=user/'.$uid;
                        break;
            case 'publications':
                        $form['#action'] = '/user/'.$uid.'/edit/publications?destination=user/'.$uid;
                        break;
        case 'conflicts':
                        $form['#action'] = '/user/'.$uid.'/edit/conflicts?destination=user/'.$uid;
                        break;
    }

        //print '<pre>'; print_r($form); print '</pre>';
        //print $form['#action'];
        $output .= drupal_render($form);
        return $output;