I don't think we need new laws or changes of law when existing laws can be used in such an event.
If someone is failing to take a duty of care and attention while driving, for whatever reason, and they cause an accident, or worse, a fatality, then they get prosecuted to the full extent of the law.
It doesn't matter whether they were on the phone, texting, eating fish and chips, reading a newspaper or doing the crossword, or any other pastime that is a distraction, if they fail to take reasonable control of their vehicle given the surroundings, then they face the possibility of a custodial sentence.
Do we really need new laws to cover the most basic requisite of sitting behind the steering wheel? If you are in charge of a moving lump of metal, you take responsibility for that moving lump of metal, and if that moving lump of metal causes an incident and you weren't paying attention, then you get penalised for moving that lump of metal without thought.