I would to inverse the axis y of the cursor anyone can help me please ? I find out this game recently and i think it has a real potential, it remembers me the cod4 moded :)

You can invert the x or y axis using the player_mouse_yaw and pitch settings, the one you're looking for is pitch, so: \player_mouse_pitch -0.022 is what you want.

To fully invert it Just set the player_mouse_sensitivity to a negative value, like:

\player_mouse_sensitivity -2

Thanks :D