You can delete a track: click on the track from a playlist or the tracks list in the Library, and you will see a large preview and a list of options (Play, Favorite, etc). Scroll down if you need to, and Delete is the last option.
Nice suggestion on the # of times played too. I'll see about squeezing that in the future.
Force Orientation fixes the direction (up?) that the track draws. Normally, when one track ends the theta (rotation) continues relative to where the last one stopped. This forces the ball to start at a zero point.
Example: the snowboarder will always be drawn facing the same direction if Force Orientation is selected for it.