Can the duplicate-checking engine help with this at all?
Probably yes. Same concept/code, more posts to go through. The duplicate-checking engine should be upgraded so it can include posts with spam flags, low-quality flags, or those that have been recently deleted with a certain period of time. A spam detector could help since it could separate the non-spam from the spam. Then maybe we could include all deleted posts with spam flags, low-quality flags, from users with suspicious behavior, and other criteria only mods know.
But I mean seriously, couldn't SE make a possible spam detector engine and another review queue? When the spam detector engine thinks that a post might be spam, it goes into the spam review queue where people with x rep and above can review. Of course, CAPTCHA and other bot/spam reviewing security might be need to included just in case though.
Naturally, this should also produce extra-strong signal to SpamRam: we deleted that as spam once already and the spammer came back and posted the exact same thing.
If the user keeps on spamming, maybe there should be a automatic message sending system that tells the accused spammer to stop spamming or the mods will shower suspensions on you and a final creepy line at the end that says something like you have been warned.
Of course before the message sends, I suppose the spam detecting engines and mods should first put the accused users on notice. And after too much spam, send a warning. And if that does not work, just delete the user's account and permanently remove the user's post from existence.
Whatever SpamRam is, it better get a much more stronger signal so it can deal with these crazy spammers appropriately.
When the user clicks
Post Your Question, there should be a warning box that says something like:
Are you sure that your post is not spam? If yes, click again to continue. But if it is spam, you will be dealt with appropriately... You have been warned.
Maybe the last line makes the warning a little too creepy but apply this to new users/users who seem to have problems with asking (previous question bans, does not have a good question rating/score, etc.). The warning should be able to make spammers rethink before posting.
Spam.SE!!!! Let's make a site where all people do is post spam so they don't have to bother with the other sites. After like 30 days, the questions are removed so the site is no completely cluttered with spam and the system doesn't go into overload... Probably, the least helpful solution here.
Spam mods? Just
hire elect some people to help with spam. Instead of a blue diamond, they would have a orange diamond or whatever color you mods decide. When spam flags are raised, they rush to the scene and have the ability to delete questions with spam flags. These people should have a great flagging history, can be trusted, and have no suspicious activity in the past.
IP address banning! This is the definition of an IP address:
An IP address (short for Internet Protocol address) is used to identify computers on the Internet. It works like a return address would on a piece of mail.
Usually spammers will try to use multiple devices so they can spam with their one account. This is supposed to help them reach more users just in case they only use one different method of using SE. If the SE system can figure out what the IP address(es) are, SE could try preventing devices with those IP address(es) to be able to access SE (which means creating an account and posting spam, etc.).
But seriously, only use this (if can) if you are sure that the user is a spammer. I mean, we can't just block good guys like me and Jon Skeet and Shog9. That's just abusing the proilege.