I'm trying to map/bind my mouse
button 4 and
button 5 to behave as kayboard
num pad 1 and
2, does exist some way to do that? Maybe with some specific software?
If I understand your question correctly I would recommend looking into a program called AutoHotKeys. It will allow you to creat scripts that enable customization over what happens when certain keys are pressed together, how many times they should be pressed, if the mouse should be clicked(left or right), where the mouse should move, and so on...