Please allow users that can use Personal Lists to be able to change their statuses regardless of their User Role.
It makes sense to me that if a user has access to Personal Lists that they should be able to change the statuses of that list, regardless of what their User Role is in the Workspace. My understanding is that the Personal List is accessible only to the person (unless they share a task) and therefore they should be able to make whatever statuses they need to better support their workflows.