I may be late on this topic, but Bravo as confirmed yesterday via his twitter account that they added to toggle on/off the zomie action to board your vehicle or take a turret. I don’t have a link because twitter is block to work, but here is what his post looks like:
“We’ve updated Infection to now include a custom game mode option for “Vehicle and Turret Use” behavior. May no Zombies board your Hog.”