As in experiment, I’ve enabled voting in the Feature Requests category. Here’s how it works:
At the top of each thread, you will see a vote and a vote count:
Click “Vote” to register your interest in the feature.
In order to keep this useful, votes are not unlimited: You will have a maximum number of vote “credits”. Most users will have 5; very forum new users will have 2 credits, and very active forum members may get a little bonus…
When a feature is implemented, the topic will be closed and you’ll get your credit back. You can also un-vote any time.