Can I just say that the idea of the ball being in play till the referee signals makes perfect sense. I have always felt uncomfortable with the concept of a referee saying "the ball was dead when I decided in my head, not when I blew the whistle". In the vast majority of cases, should a second offence happen before the referee has whistled, it makes no difference as "restart based on the first offence" is clear in Law. Should the ref drop the whistle or it ceases to function then in this extremely rare circumstance the ref is entitled to call out "STOP!" (Law 9 merely says play has been stopped by referee).