Better or worse option that safety car, and how the hell does virtual safety car work anyway?
I liked how they were implemented for Le Mans - seemed like they crammed in as many as possible (reasonable) between slow corners.
I've often imagined a system that lets race control press a button that cuts everyone's engines and limits them to a certain speed as well. That would be cool. "Speed limiter in 3 ... 2 ... 1 ...".
Of course, there'll be times when the safety car is still necessary, but I like the way these new options protect the integrity of the gaps.