Right now, the only option for limiting the number of votes in brackets is to allow users to be limited on the number of votes per round or match. We’d like to propose that you add a new option that limits the number of votes per day per match.
This would allow us to tell a user, “you can vote once a day on all matches”, instead of “you can vote 5 times this round on all matches”. The reason is that if people use all their votes in a single day, the repetition of coming back to the site each day is lost and they may not return for the next round.