Back in March, YouTube created a feedback form through Google Moderator to take new feature suggestions from YouTube Partners. They've decided to do this again, and you can read more about it here.
I don't know if there is any kind of restriction that only allows YouTube Partners to submit features or to vote on them. If there is, feel free to pass your idea on to me and I can consider posting it. The features are generally Partner related, so if there's something you think needs to be fixed regarding the program (or the features in it), this can be an opportunity to let YouTube know.