I like this idea, but not without many more staff. Given that only a fraction of the spam is currently being reported, and it sometimes takes 24-48 hours for these reports to be acted upon in boards without a dedicated mod, it is easy to see how within a few days or weeks a backlog could build up which would never be cleared. Genuine newbies could potentially have their posts lost in this backlog and eventually give up when nothing they write is actually posted. We need more staff to guarantee this doesn't happen.
Maybe some "junior" type of moderator could be established who can only approve posts but can't delete/nuke/ban/etc. And there could be many of those, like a dozen on a busy board. So that the flow of acceptable newbie posts wouldn't be impeded much, but any garbage would have to wait for "senior" moderator's decision.