No, Robin2 is thinking (I think - he can answer for himself 
) of that the newbie has to write a one (or more) posts just saying "hello I have just started ...." type pleasantaries. Then (s)he can write a proper question with a proper subject.
Spammers enrol, and start sending adverts. As they do not choose the "magic subject line" for their post they would be automtically blocked. Until they adjust the robots to send the first magic post.
I think Jacks original idea is sound enough. If one leaves out my "enhacement" then basically any newbie and any spammer is just put in the queue. 1st-post-approvers just need to use 2 seconds to look at the post if it is Arduino relevant (they do NOT need to answer, just approve - it then is visible to all) or hit delete (which deletes the post and user).
(Now either I or Jack will follow the link at the bottom on EACH webpage to SimpleMachines documentation to see if it is exensible.)