This would be amazing and would make the game a lot more fun. I can see why they like their retrain tokens but having to redo the tree every single time and reslot traits is a pain in the butt. Give us dual spec already, wow had it back in 2004.
I agree completely with #1, #2, and #8. A scoreboard would be extremely helpful to learn how much more damage or whatever you needed to do to get first place, as well as a current scoreboard accessible at anytime.