A Newly Created account should be modified with the following protocols,
1.) A newly created account cannot start a new topic for the first 30 Days or so. Let them browse through the forum, understand everything and get a good touch of it & decide if they want to continue here as per the Rules & Regulations, else simply EXIT.
2.) Newly created accounts cannot post more than 2 Times per day for the first 30 days. In short they can only post 2 times every day. I said it 2 post per day because, they will get 14 Activity per 14 days (if they stay active on the forum for 7 days at-least, which indirectly means that they will make 2 post per day).
3.) A newly created account cannot post a Link anywhere on the forum during these 30 days restriction period. A minimum of 28 Activity is must for every member to even have the authority to post a link.
I highly doubt theymos would impose more restrictions on real users. Many new users go to this forum to ask for help with something related to Bitcoin (be it wallets, transactions or lost keys). Those users should not be forced to wait 30 days before they can create a new topic.
Even worse: what you suggest only hurts real users, while it doesn't matter for spammers at all! A spammer can easily create thousands of accounts, wait 30 days, and start spamming. In fact, many of the new spambots I've seen use older accounts already.
PS
Your
first post was a new topic including links

With your suggestions, that wouldn't have been possible.