The board noted in its report that this was a "curious position" and stated that psychological opinion was to the effect that he was a "high risk sexual offender".
Miller was found guilty of committing an indecent act on a 6-year-old in September 2008 after he was spotted in a car with her by a Napier community patrol volunteer in Nelson Park.
The extent of his sexual offending was brought to light by this incident and resulted in the police reopening past claims of sexual abuse against Miller.
He had sexually abused several girls over the course of 18 years; raping one of them twice at ages 10 and 11 while he was her babysitter in 1990.
In his 2008 trial the court heard he had "cultivated the girls' families" to get into a position of trust.
He earned an extra three months' imprisonment after making a shooting gesture to the public gallery where several of his victims stood at the end of his trial.
Sensible Sentencing Trust founder Garth McVicar said Miller's sentence, although fully served, was "pathetic" and reflected an ideology that the rights of offenders come before the rights of victims.
"It's inhumane, cruel and barbaric to the victims and also to the wider community. It's one of the biggest contributing factors to the child abuse rates and high recidivism in this country."
Final release conditions will be fixed when Miller is before the board one last time in September.