Haha, I just wanted to see if I could stop the actual spam. I couldn't think of a good way to do it other than to make unobtrusive spam. Still spam, but better spam. :)
Yeah, I think accounts with public posting keys are an interesting idea but will ultimately tend to being used for spam.
see my post in the other thread. there is a way to make it work.
https://steemit.com/@sigmajin/re-themasses-anybody-know-how-to-write-a-bot-to-delete-comments-by-this-account-20170127t134033986z
edit -- though im not sure if this would work at all with steemit.com to broadcast the one party signed transaction (or even to log in for that matter). That said, it would probably be really easy to make a web interface to broadcast the initial transaction no log in and the public posting key wif right in the function.
:)