I understand the scale of the problem, but I think some mechanism needs to be put into play where these people could be heard. It's not just people with mortgages, it's small businesses, farmers, retirees, and probably more that have been hurt.
Perhaps written submissions could be invited, with the opportunity to have some sort of parallel hearings in all states and territories for aggrieved customers to present the more complex cases, sort of like victim impact statements.
The collated results from the written submissions & the personal presentations should then be passed on to the Commission, so the Commission understands the full extent of the misery caused by the banks etc. malfeasances & malpractices.
Yes, it will cost a lot of money, but in my opinion, it is necessary to open this up and show the human toll of the greed that has been fostered as part of the finance sector's corporate ethos. Only then will it be possible to remediate the situation. I also think that the financial sector should be made to pay the costs (based on their involvement in malfeasance & malpractice) as they are the cause of the problem.
I also support criminal proceedings being taken against the office holders who partook, promoted, or failed to prevent the malfeasances & malpractices.