I've noticed a small issue.
When you've set up controls to a gamepad and play, if you press two "Move X" buttons simultaneously (down + left for example) the sprites movement stops completely until you let one go, upon which it continues to move.
I've tested this with both a Dual Shock 2 and an XB360 pad and both did the same thing. I don't know if the problem applies for analog sticks, but I doubt it. The plugin doesn't do this when using the keyboard for controls, so it must be something specific to the joystick part of the plugin.