RB5009 has EEE enabled at least on ether2-8 since it was released and among all ROS versions released for it. Just checked again on a Cisco SG350 connected to ether2 of a RB5009: The SG350 clearly shows that EEE is enabled and active on RB5009. And as mentioned it was that way since RB5009 was released.
So no need for supout. Just get any RB5009 in your testlab, it will have EEE enabled.
This is what the SG350 reports (gi1 is connected to RB5009 ether2, remote status is EEE status of RB5009 ether2)
#show eee gi1
Port Status: up
...
Current port speed: 1000 Mbps
EEE Remote status: enabled
EEE Administrate status: enabled
EEE Operational status: enabled
...
PS
There is IMO nothing wrong with having EEE enabled by default. It just should be documented and have an option to turn it off.