Gravity is always on? Drifting?

[quentinfool]

Gravity
It seems that when moving a sprite, it always goes faster moving down?
This happens even when
play.set_gravity(vertical=[any_number or None], horizontal=None)
or
ant.start_physics(can_move=True, stable=True, x_speed=0, y_speed=0, obeys_gravity=False, bounciness=0, mass=10, friction=999.0)
or even
ant.stop_physics()

Drifting
And figeting with physics (bounciness, mass, friction), I could not prevent the sprite from "drifting" when obeys_gravity=False, without turning physics off

my full example is attached, based on pieces from the documentation. I am really excited about this quick Python GUI tool.