Is it possible to spoof the user IP address during action=edit? It sounds like an unsavory question, but let me explain. Let's say an anonymous user edits a page in my application, which, in turn, uses a MediaWiki API client to make the necessary token/edit requests. The resulting user is not the IP address of the anonymous user, rather it's the IP address of the API client. As a result, every anonymous user that uses my application is truly, irrevocably anonymous. This is why I wonder if it's possible to send an arbitrary user IP address along with the edit request.
Jim