i just found out that you can remap the pedal buttons
if you switch the controller, to D (d-input mode) mode and set retroarch´s input driver to d-input retroarch recognize the buttons now as additional buttons .
also DON´T load a profile in this D-Input mode the buttons only working without a mapping from the ultimate software itself , you could unmap them in the profiles i guess
kinda strange i was pretty sure i allready testet that exactly this way a year ago where i got it. read so many other posr where all hope where lost for this function it seemed.
and still couldn´t find a solution til today somewhere , so i thought i spread the word
ps. xpadder works aswell in this mode