You touch on another interesting area. How to rank the importance of features. I am careful to highlight our own work, but do a search for Aha! Scorecards and Aha! Scores. We introduced a way for teams to enter into their account their own key business metrics and then rank features against them. It's hard to game the system when you are asked to rank the importance of features against real business goals (sales, support, internationalization, mobile, etc.) and then forced to defend your rankings if there is disagreement.