I support this, since the highlights displayed can often seem pretty random. Geoguessr has the ability to do something like this. Over time you can gain trophies for participating in competitions. You also have a trophy case where you can display your favorites. If there were a button on AO that said “Edit Leaderboard Highlights” you could select nine highlights from the full list. It would also be a good way to see which leaderboards you have made it onto.