The chair of the House of Representatives Standing Committee on Economics, Liberal MP David Coleman, has raised three possible reforms in his questioning of Commonwealth Bank chief executive Ian Narev and ANZ CEO Shayne Elliott over the past couple of days, suggesting the direction in which any future government reform of the sector might go.Coleman has asked the bank CEOs why they don't offer mortgages with "tracker rates" and what their approach would be if they were mandated.He has asked about measures that would improve account switching processes, to make it easier for consumers to move their business from one bank to another.And he has asked about their attitude to the creation of a tribunal to complement the work of existing external dispute resolution schemes.A tracker mortgage is a variable rate loan that matches changes in the central bank cash rate. They do not match the official rate but charge a constant margin above that rate. They are offered by lenders in the United Kingdom but are not common in the Australian market.Elliott said there was a place for tracker loans but he doubted they would be popular."We have looked at it. There is a high risk for us in our ability to fund it. We are locked into that margin. We would have to price for that risk and the product would have a premium," he said.Elliott said borrowers who were worried about their interest rate exposure would be more likely to fix their rates and get certainty that way.In 2012 the government introduced account switching rules to make it easier for customers to move their accounts. The so-called "tick and flick" scheme allowed customers to sign a document authorising their new financial institution to execute the transfer of direct debits, direct credits and other payment arrangements on their behalf.Ever since then banks have argued about how effective these changes have been, with some saying that the big banks drag their feet and take up to a month to effect transfers.At the time, there was a push to introduce full account number portability but a review by former Reserve Bank governor Bernie Fraser rejected this as too costly.One problem with the current system is that it is not subject to any monitoring or performance measurement, so no one really knows how it works.Elliott said the system was "clunky" but most transfers were completed in 24 hours. He said the technology had "moved on", providing scope for the system to be improved.He said the bank would co-operate in any new system that involved a more open transfer of account data between financial institutions."We are custodians of customers' money and data. We have a responsibility to keep both safe," he said."If customers choose to make that available to otherwise should do that but we need to make sure the customer is protected."The tribunal idea raised by Coleman over the past couple of days was outlined in a consultation paper issued by the Treasurer last month which forms the basis of a