It comes after a pair were granted permanent name suppression despite pleading guilty to charges of sexual conduct with a young person.
Nate Nauer was jailed for laundering money for the Comancheros gang.
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"These changes will make an immediate and meaningful difference to the lives of the victims."
Defence lawyer Marc Corlett said their evidence will show Benbow is innocent of murder.
Palmerston North men Floyd Harris and Jake Ginders were killed in a fatal crash in January 2019.
Some victims are dropping out, while defendants are staying longer in prison on remand than their final sentence time.
"I can be very clear with you, it's not part of my working agenda."
The teen was sentenced to 11 months in jail in 2001 for a number of offences.