I don't know how he's doing it. Planetary Empires rules allow for it via owning a command bastion and using the special rule it allows you to give for that purpose. But I don't know any ruleset that allows just coughing up points for it.
At any rate, it absolutely should not be done. There is nothing less fun than a unit of Thunderwolves with a Thunderwolf-mounted Wolf Lord with Saga of the Warrior Born multiassaulting half your deployment zone the turn they arrive.