Lucius Quinctius Cincinnatus

No, that would have been bad. History has already showed us what dictator did to Rome. Caesar was good at first too but perpetually during his reign he lost his touch. After his assassination and the civil war from 44 to 31 BCE Rome had it's first taste as a true dictatorship. Without the proper control of the senate and republican process they all became completely mad. After Nero and Caligula, Rome was so fucked that not even great rulers such as Diocletian and Constantine could fix it. Creating the dictatorship earlier might have lead to the avoidance of the Ides of March and perhaps a lack of Julius's military conquests. Changing history so greatly could have greatly affected the present.