Similar to CPC-3, this deals more directly with the Parole Board's discretion as to whether granting a record suspension would bring the administration of justice into disrepute. I believe that the bulk of applicants who would apply for this are upstanding citizens, and they'll have no issues in being approved by the board.
That being said, we should still let the Parole Board do its work. If the government doesn't believe that the Parole Board has work to do, then this government should have introduced expungement of records as opposed to record suspensions.
That's the rationale behind CPC-4.