The ability to cancel ghosts. Say, if you make a ghost on a track like a wheelie practice track, and do it bad but fast. Then you want to make another ghost that is longer and more skillful. But the longer and better on will not show up because you already have a faster ghost. Maybe be able to clear your ghost on a track would be a cool feature.
or maybe this way: make it save all your ghosts and everyone can view all your ghosts; you can delete some terrible ghosts and "star" your best ghosts on a track
