Sudden death is good for takedown and TDM, but takes all the objective play away from the rest of the modes. So I have a few ideas for the final rounds. For Splitball: 3 balls spawn all at once, but only 3. For fire c******: Arm, Defuse, countdown, and the round timer are all cut in half. For Domination: score limit in half, capture time doubled. For Hot zone: only one capture point, and the capture time is doubled. For KotH: score limit in half and increasing spawn timers like takedown. That's all the modes I can remember. Hope this inspires something.