Is there a way I can start a Public Krew?
You can’t, really. Admins decide when Krews are started and/or disbanded. If demand for a specific Krew is outstanding, then an admin might consider it. (Note: Badgering the admins doesn’t help.) You can create a Social Group, however, which is similar to user groups/krews. Social Groups do not have special display stars but have group messaging capabilities.