Not easily. You'd effectively have to have a security level defined in the project's Issue Security that is specific to that issue, apply that level to that issue (and apply the 'normal' level to all other issues), then add the new user to that issue specific security level. That's high level; I've never used issue security, but that's the only way I can think of... you can't do it using normal role-based privs, as those apply to all issues in the project.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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