Be persistent in your quest, look for alternate sources. Rover is not a 'restricted' item. It is only the Trane branch that restricts its sale. Look for other dealers of Trane equipment that will order it from the factory for you.
Trane wants to sell equipment with controls in them.
If you are persistent and creative it will come to you.
See if there is a Trane Residential/Light Commercial Dealer that is separate from the branch (not another mechanical contractor but a vendor) and they can generally help you. I too, thought Rover was a restricted product but was just talking to a guy who had a copy and he bought it through the dealer channel rather than from an actual branch.
Edit: Craig, I just noticed you are from Down Under. It might be a little more difficult there as I don't know what the distribution structure is like. It might be that you can only buy Trane parts etc. from Trane exclusively there.