Rally does not support the OS_INTERFACE variable

Under the current openstack 2.4.0 CLI, the OS_INTERFACE variable is supported:

  --os-interface <interface>
                        Select an interface type. Valid interface types:
                        [admin, public, internal]. (Env: OS_INTERFACE)

Without the OS_INTERFACE set, the openstack commands which hit keystone based routines (project create, project list, etc) fail within my given Liberty environment.

Rally is hitting the same problem, except I couldn't find any direct support for the OS_INTERFACE variable within Rally. Prior to writing an enhancement request defect, I wanted to confirm the lack of support. Additionally, looking for possible workarounds within Rally.