Is there a command to invert the vertical axis?
edit: oh you said vertical, not sure about that. Maybe theres a sensitivity for x and Y? you can use tab to auto complete in the console. Maybe you can find something in /player_mouse_
apparently setting negative sensitivity does this?
so i think the command is
:( oh well
Setting player_mouse_sensitivity to negative values will invert both the X and Y axis. But if you set player_mouse_pitch to -0.022 it will invert only the Y axis (vertical/up and down on your screen) :)
doesnt work, wont be able to pitch at all with negative value, unlike q3. just tried. =(