I don't understand the use of it, it doesn't make sense for me to create events with pre and post-roll, like creating them by just having -15 instead of -5
It would make more sense if pre and post roll could be set and enabled/disabled for certain eventlists/playlists (whatever it is called), because you wouln't use them for highlight reels, but would use them if you just play certain events out to a mixer/director, for example.