Locomotion is nothing more then agility and acceleration. A few of the EA developers said that over E3. All it deals with is free range movement in space. How fast a player reaches top speed and how well he can change directions.
Player interaction doesn't use locomotion at all.
Locomotion to me is all of the following:
Acceleration
De-Celeration
Foot Planting (Cutting/Juking/Spinning)
Agility
Top End Speed
Running Animations