In order to mitigate scripted spam postings, it would be useful to have the ability to limit the number of new posts to one per minute or so with a time limit which should be configurable. That would really be helpful for Ask Fedora at this point since we have a persistent spammer
We have just implemented ReCaptcha for making posts for users who have "watched" status. Should effectively work along the lines of rate limiting.
The "watched" status will automatically convert into "approved" when certain reputation threshold is crossed from below and it will still be possible to assign the "watched" status back.
Admins, moderators and approved users won't need to use the captcha. Also the captcha will be forced upon the user registration.
Comments
The rate limit itself is easy to bypass by inserting a "sleep()" call into the script.