I was reminded by FunkOff's "new balance" thread, that a feature I've always thought would be interesting is ingame polling. Since after all, forum polls only capture a small and unrepresentative fraction of the playerbase.
When you log in to FAF, it displays a poll question, either as a banner (less annoying) or popup (more annoying). You can click and give an answer. Or it might link to a forum thread or text box for more detailed explanation.
Poll questions can be set by the Dev team to get feedback about important issues they feel need a community response.