To prevent cars losing a lap in a pitstop during a caution period, I believe that the wavebys (or whatever they are called) should be given before opening the pitlane. And the waveby rule should say: every driver in front of their class leader can overtake the safety car and go to the back of the column - first the fastest class and last the slowest class.
As long as drivers don't push the pedal to the metal, allowing cars to overtake the safety car isn't dangerous.
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