I had trouble with my d-pad when I first used your plug-in but, then I realized I had set the horizontal as vertical. So I went back and on the 'Vert Axis' button I pressed either Up or Down.
I actually prefer your plug-in better to the built in one since the analog seems to be more sensitive. In FFX when using the other controller plugin you can't walk since the controls are to sensitive (for me at least). With your its difficult but possible to walk by finding a sweet spot pushing the analog. This is using an X-box controller with a usb adapter.