The ascii names field is currently not included in the webservice response. May I ask what you want to do with it? Normally it is used to implement search functionality and therefore it was not included in the web service response as the search was done by the service itself.
I need it in order to generate urls without special characters.
I worried about issues that could happen if I use special characthers like Łódź in a url. But maybe it's not a problem since I see that also wikipedia use it: http://en.wikipedia.org/wiki/Łódź Using asciiname this issue shouldn't happen.