Manually Add Star Ratings?

I know there are tons of plugins that allow your visitors to rate a post, comment, etc, like GD star rating. What I really need is a plugin or something that allows users to vote on only CERTAIN posts I make. Which would mean I would have to manually insert the code per post or something, or maybe do it only for posts that are added to a specific category. Something like that, that doesn’t automatically put a “vote” system on every page, just certain pages/posts that I choose. Is there something like that out there?

Thanks.