theymos has given a good development you can try it by clicking this link
https://bitcointalk.org/captcha_code.php there you will be given a private key that can help you to baypass captcha so you log in do not need to use the captcha again.
yes, you are right I often use links that are given by admins in this forum to be able to log in faster and simpler without having to work hard against the captcha.