F1 has been and always will be from a standing start. There is no pace car. And you'll never see a roadster as the F1 safety car as it has no room for all the safety gear and com equipment it carries on board.
Safety car is just another term for pace car. And the SLS has already been used to pace the field;
http://www.formula1.com/inside_f1/rules_and_regulations/sporting_regulations/8687/

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