Minor playability enhancement: Instead of having mail messages pop up on the side, which I often miss since my attention if focused elsewhere on the screen, how about having a "ticker tape" located across the top of the screen?
Related, I like being able to hover over a mail message, but having to move to mid-screen to release it is annoying. Again, little thing.
BTW - playing at 1920 x 1080.
Right click on the mail deletes it without opening.