I would like to add two pit stop related ones:
1. Refueling - Technology can be advanced to make it safer I would say. Less fuel/smaller fuel tanks might also result in faster lap times. Also adds a bit of strategy, although I assume everyone will find the optimum theoretical strategy pretty quickly. Still.
2. Minimum pit stop times, the minimum limit would be a second or two more than adding a splash of fuel, but less than a full refuel. This way during a Safety car (or even not during a SC) there's an additional strategy component.
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