Change key map on the kindle with Duokan ?

Hi,

I would like to change the map of my key in my Kindle (I speak about the key on both side of the Kindle).
Indeed, I want that the up arrow key let me go to the "next page" (and not anymore to the "previous page" of the book and so the "down arrow key" let me go to the "previous page" and not the "next page".

Is it possible to do so with Duokan ?
I have found a "has_key.py" file but not sure that it's the right one and not sure to know which key to change there.

Thank you !

P.S: I have this Kindle : http://www.amazon.fr/Kindle-recondit...eywords=kindle