Disabling Built In Physics

Engine 4.5
Paper 2D

We are rolling our own basic physics, how can we go about disabling gravity, friction, ect… ?

CharacterMovement->GravityScale = 2.0f;
CharacterMovement->AirControl = 0.80f;
CharacterMovement->JumpZVelocity = 650.f;
CharacterMovement->GroundFriction = 3.0f;
CharacterMovement->MaxWalkSpeed = 280.0f;
CharacterMovement->MaxFlySpeed = 600.0f;

Using custom collision channels solved our problem:

Answer here:

Thanks to BadderThanBad for pointing me in the right direction.