Using a mouse as a directional axis?

[Weilii]

Sorry if this has been asked before but I searched the forums and found nothing. The word 'mouse' didnt even give a result.

I was wondering if it was possible to setup a computer mouse to act as one of the directional buttons. I was thinking the C button. I didnt see anyway to do it under the gamepad menu but Im really new to this.

Edit: Also, I would like to be able to use the mouse buttons as well but I dont see a way to do that either.