Emulated Shake Problem

[SonicPhayze]

Hi, I'm having trouble with the emulated shake feature of the wiimote plugin. I'm currently playing Wario Land: Shake It, and I am using a gamepad to play (Xbox 360 gamepad to be specific). So I've got the "Shake" action mapped to the Y button on the Xbox 360 controller. When I hold down Y, it shakes at random intervals, and not a solid shake. I've also tried mapping it to the default keyboard function and that didn't work either. Is it supposed to do this? Is there a way I can fix this? Thank you.