Now I just copy an existing item within ARS and change the version number, link it to the new file and done.
The only thing which could be improved is the editor button to select an ARS item which doesn't work well as soon as you apply filters.
I have to say I'm impressed with the result. During the last two weeks the plugin catched almost 1500 attemps, all with the StopForumSpam engine.
I've even disabled the captcha to see how many go through.
A few managed to register but those usually got caught by another spam extension.
I can live with that :-)