This question has been answered by jarofgreen. See the first response.
$a = $modx->actions['mynamespace:foo/bar']
public function getURL($controller) {
foreach($this->modx->actionMap as $action) {
if ($action['namespace'] == 'whisky' && $action['controller'] == $controller) {
return '/manager/?a='.$action['id'];
}
}
}
$actionId = $modx->actions[$controller . '/' , $namespace] return '/manager/?a='.$actionId;
$actions = $this->modx->request->getAllActionIDs('core');
$actionId = $actions[$controller . '/' , $namespace];
return '/manager/?a='.$actionId;