[rally] possibility to skip admin=True validation

Hi list I'd like to run rally against barbican. Since all barbican scenarios are tagged with @validation.add("required_platform", platform="openstack", admin=True) we cannot use them since our rally configuration does not have an admin user. (actually test itself should succeed, but the validation fails). Question: Is it somehow possible to skip (or unset admin=True requirement) for validation in the task configuration or do I have to rewrite the scenario ? Cheers Benedikt