I think that you should be able to mass delete games. Its really annoying having to click delete and then wait for the screen to load again, and having to do it all over again cuz you got about 100 games in your faves. It would especially be more difficult for people with slow computers.
Your mouse has a wheel to scroll right.Well if you click the wheel it gives you another tab.Now click all the games you want to delete with the wheel and your done.