Two members of the commission say they are both concerned and surprised at the pope's decision to appoint a bishop in Chile who is accused of covering up abuse.
The Catholic church is "no longer a safe haven for child abusers," said a top priest psychologist who advises the U.S. bishops on child sexual abuse.
Msgr. Stephen Rossetti told hundreds of Irish delegates to the first national conference on safeguarding children that the Catholic church in the United States spent $43 million on child abuse prevention and education just last year.
Bringing more expertise and more geographic balance, the larger commission and the global nature of the church could add to the complexity, rather than reduce it.
Peter Saunders, an English survivor of clerical abuse, had called on Pope Francis in July to hand over information about abusive priests to state authorities.
A papal commission on child protection will be expanding its nine-member panel to include more experts and another survivor of clerical abuse.
One of the Irish survivors of clerical sexual abuse who met Pope Francis on Monday described the encounter as a "huge vindication" for her.
The victim, Marie Kane, also asked the pope to remove Cardinal Sean Brady as archbishop of Armagh, Northern Ireland.
The Council of Cardinals will meet again this week, presumably to consider an overall blueprint for a new structure of the Vatican's central bureaucracy.
Some victims' advocates dismissed the upcoming meeting as "meaningless" while others endorsed it as a positive step, though long overdue.
Aboard the papal plane: Pope Francis said he will meet with six to eight sex abuse victims and confirmed an investigation of the Vatican's former secretary of state.
Ahead of Pope Francis' first meeting with his panel charged with tackling the clergy abuse scandal, victims are demanding the church take immediate action to expose perpetrators.