Multiplayer with gamepad support

How do you add gamepad support to a multiplayer game?
It seems that when using gamepads, it controls both players. Say Player A is at his computer and using his game pad. He will be controlling both is player and Player B that is using his gamepad. Does the TopDownGampadMapper not work with multiplayer games that are played online?

Ok, I got it to work on a test game. However, it causes the other player to shake and bounce when using the gamepad. Is there a way to prevent this from happening?