Mr Roberts and Mr Pederson were part of a group of motorcyclists who had been at an event in Invercargill.
They were on State Highway 8 at Tarras, near Wanaka, when Zheng lost control of her car, and were unable to get out of the way.
Zheng told police "the car just crashed into them".
She had obtained her Chinese driver's licence in December 2011, and within six weeks had moved to Australia to study.
She did not drive in Australia.
On 24 November, 2012, she flew from Sydney to Christchurch, and the next day hired a rental car with her Chinese licence and drove to Tekapo.
She admitted two charges of careless driving causing death and two of careless driving causing injury. She was disqualified from driving for two years and ordered to pay $10,000 in emotional-harm payments.
Senior Sergeant John Fookes of the Queenstown police told coroner Richard McElrea that officers should be able to ban unskilled drivers and seize their licences.
He said police in areas such as Queenstown had noticed a rise in accidents caused by tourists not used to New Zealand conditions.
Accidents were often caused by "the inability of a proportion of these drivers to have proper control of their hired motor vehicle".
Mr Fookes said it was unclear under the Land Transport Act whether police could remove such drivers from the road.
"That would appear to be where a significant gap exists."
Acting area commander Inspector Andrew Burns said the New Zealand Transport Agency would look at the issue, especially on the West Coast and other popular tourist areas.
Coroner McElrea did not make any recommendations, but said he would seek advice from police national headquarters on whether law changes were necessary.
- Otago Daily Times