I just added my vote to this request. It is a good idea, for reasons already stated. The suggested work-around involving a plain-text CSV export introduces security risks, and while I’m happy to see that there is a solution available using the CLI (thanks @dh024!), this method will probably be intimidating for many.
Even if an advanced search query of the form >login.password:MyLeakedPassword were required, this would be a very helpful feature.