In my honest opinion this would be an important feature: the possibility to show a CAPTCHA on the gateway instead of a voting link, so only if the captcha is correct the vote will be counted.
I've found really annoying the use of auto-voters, sites that usually get 5 votes and then on the first day of the month they get around 200, so I think this should be quite helpful to avoid this, though not 100% effective.
Also, if anyone knows in a way of implementing this on the current version, it would also be greatly appreciated. I've searched it before, and tried implementing it myself: it showed the captcha, but couldn't make it not to count the vote if the captcha was incorrect.
