After each quest that a player completes within the game, a screen will come up asking beta testers to rate the quest and give in their feedback. This approach is, in my opinion, head and shoulders above the "hope they come to the beta boards" approach that I've seen from companies in the past. This method, right there and in your face, prompts you to take a few seconds and make a comment and indicates to me that Sigil is actually interested in what players have to say about the game and ways to improve it.