The first thing that crossed my mind is a mandatory course to anyone who wish to earn money through bounty on this forum: how to behave, how to post, etc.
Instead of making people create another account, leverage the account they already own, and attach services to that. He needs to build tools that people can use on this forum.
This is an important point, and definitely the way to go. It's always more efficient and productive to encourage people instead of blaming them. People would take better care of their account (and credential) with their hard earned merit, courses, trust, etc.