What are you suggesting is the feature which is "running backwards"?
There are no radial rotor slots which would clear debris off the pad (which are designed to effectively move the debris "outward" from the centre of rotation of the wheel), the cooling vanes are not radial either.
The only thing you could be looking at are the cross drilled holes and these serve to de-gas the pad during hard, long braking but are not influenced by moving forward or backward over the pad face.
There are no radial rotor slots which would clear debris off the pad (which are designed to effectively move the debris "outward" from the centre of rotation of the wheel), the cooling vanes are not radial either.
The only thing you could be looking at are the cross drilled holes and these serve to de-gas the pad during hard, long braking but are not influenced by moving forward or backward over the pad face.