In order to mitigate password vulnerabilities and attacks, please add multi-factor authentication to Smartsheet. It's a security best practice and most SaaS applications (such as Smartsheet) already has this integration available.
We love this idea too! While it's not a part of our current plan, this is exactly the kind of thing our team is thinking about every day. When we believe we can make this idea a reality, we'll plan to update the status here.