can a magento adminhtml field depend on more then one field or value?

Question

In http://alanstorm.com/magento_system_configuration_in_depth_tutorial @AlanStorm gives a very good tutorial for system configuration.

He also explains how to use a

Answer 1

Andrew's answer almost did the trick. I'm on 1.6.2.0 right now and I modified the initFields() method in app\code\core\Mage\Adminhtml\Block\System\Config\Form.php as follows:

if ($e->depends) {
    foreach ($e->depends->children() as $dependent) {
        Mage::log((array)$dependent);
        $dependentId = $section->getName()
            . '_' . $group->getName()
            . '_' . $fieldPrefix
            . $dependent->getName();

        if ($dependent->hasChildren()) {
            $dependentValue = (array) $dependent;
            $dependentValue = array_values($dependentValue);
        } else {
            $dependentValue = (string) $dependent;
        }

        $shouldBeAddedDependence = true;
        $dependentFieldName      = $fieldPrefix . $dependent->getName();
        $dependentField          = $group->fields->$dependentFieldName;
        /*
         * If dependent field can't be shown in current scope and real dependent config value
         * is not equal to preferred one, then hide dependence fields by adding dependence
         * based on not shown field (not rendered field)
         */
        if (!$this->_canShowField($dependentField)) {
            $dependentFullPath = $section->getName()
                . '/' . $group->getName()
                . '/' . $fieldPrefix
                . $dependent->getName();
            if (is_array($dependentValue)) {
                foreach ($dependentValue as $dependentOption) {
                    $shouldBeAddedDependence |= $dependentOption != Mage::getStoreConfig(
                        $dependentFullPath,
                        $this->getStoreCode()
                    );
                }
            } else {
                $shouldBeAddedDependence = $dependentValue != Mage::getStoreConfig(
                    $dependentFullPath,
                    $this->getStoreCode()
                );
            }
        }
        if($shouldBeAddedDependence) {
            $this->_getDependence()
                ->addFieldMap($id, $id)
                ->addFieldMap($dependentId, $dependentId)
                ->addFieldDependence($id, $dependentId, $dependentValue);
        }
    }
}

Also it's not necessary to edit the core files. I overrode the admin theme to insert my own version of form.js and rewrote the two PHP classes using the config.xml of a custom module.