A rolling natural start could be an option per race. I agree that it makes sense to have it in e.g. endurance races, or, as you said, in entry level races where a fast start can ruin the race experience for many. Regardless if it is caused by sandbaggers or not. On the other hand, in e.g. a crit race, the fast start is part of the race type, and it would be unnatural to apply it there.
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