Oh yeah I'm talking about the optionals ones, I'm not sure about adding the story one since you can't repeat it without redoing the game all over or force exit the game.

Edit: Adding a horse racing category and filter for the different cup and difficulty should be good enough (bronze,silver,gold,platinum and black)

Since there is no official leaderboard I think it would be a good idea to add that in and, well, racing is always fun to grind :P.