let me see.. open config.cfg file in esf directory and put this in!
bind "KP_HOME" "cam_idealyaw 225"
bind "KP_UPARROW" "cam_idealyaw 180"
bind "KP_PGUP" "cam_idealyaw 135"
bind "KP_LEFTARROW" "cam_idealyaw 270"
bind "KP_RIGHTARROW" "cam_idealyaw 90"
bind "KP_END" "cam_idealyaw 315"
bind "KP_DOWNARROW" "cam_idealyaw 0"
bind "KP_PGDN" "cam_idealyaw 45"
now you can rotate whit whit numpad key's..