Again, I would suggest you spend some time familiarizing yourself with the rules of the system.
Start with the basics: reasoning from effect.
"I want the character to knock people back really far when he's running."
"You mean anytime he runs, people around him go flying?"
"No, only when he runs into them."
"Ok...so when he does a Move Through, they get sent flying. Is that a facet of his STR?"
"No, it's from his running."
"Running doesn't do damage. Velocity-based damage is part of the Move Through Maneuver, however -- do you want the increased knock back to apply to all damage done from the Move Through Maneuver?"
"Yes."
"OK, you'll need to familiarize yourself with the rules regarding placing Advantages on Maneuvers. In particular, you're going to need to calculate the effective Active Cost of the Move Through Maneuver in order to determine the cost of the Double Knockback Advantage on it...and then pay for that cost. It won't be particularly cheap."