I don't think an automated submission tool can make any good to one's website rankings. It might very well damage it or even worse, getting it into google blacklist.
I use Advanced WebRanking which is only showing you the relevant search engines and guides you directly to the submission page. BUT it's not automtic, because eventually, you are the one who submits the page. Anyway, I use AWR mostly for their good reporting system of the URLs I track.
I think that using automated submission systems, one can only jeopardize his current rankings. Just my 2 cents ...