we will add a new property “gravityScale” to our colliders to target exactly this behavior. It will be available within the next daily build for pro-customers.
A possible workaround, could be applying a linear impulse with the same force but in the opposite direction of the gravity. This must be done in the same rate as the update rate of the PhysicsWorld, possibly with a Timer with a matching interval. Though I’m not sure if you can achieve perfect results this way.
An example of applying a linear impulse can be found here, right at the bottom of the code: