Ask if you wish to leave edit even page when there is unsaved meta data
WordPress has some functionality now that alerts the user if changes have been made but not saved ('Updated'). The screen holds and asks if you want to 'Leave Page' or 'Stay on Page'.
It's a great feature, but The Event Calendar (and Pro) do not seem to be employing this feature. I've lost a few events by getting distracted then navigating away.
Vote me up!