This is essentially a newbie jail, which theymos has stated clearly he will never re-introduce.
I know about that statement, which is why I emphasized that it was probably a bad option. But I still think that something in that direction would be a good filter to separate the good from the bad newbies. Good and active members would get out of such a jail very quick, it take only 1 merit + activity.
I remember a discussion in one of the technical boards not long ago were a seasoned member speculated that the newbie who started the thread might be an alt of someone wearing a signature.
We probably think of the same topic, but lately I've seen at least 4-5 similar ones in which some members express doubts about whether it's a legitimate newbie question, or fake one just starting discussion to get signature alt accounts in action. Of course I will not cite examples, because there is no point in making any allegations without solid evidence.
I have an alternative idea, signature is automatically disabled on thread if the OP is newbie. That way, we don't need to restrict newbie account in any way.
If it's genuine question, OP is more likely to get helpful answer since spammer aren't interested on thread where it's signature is disabled.
Good idea, this would definitely prevent anyone from opening a topic with the intention of using their alt accounts for signature spam. The question remains how technically feasible is this?
Thank you all for your answers and suggestions