Are you wanting to use the F4 as a support craft, that is the player is a soldier on the ground and the F4 bombs a certain area?
If so i would try to use the script "Airstrike + Napalm (map click) by LCD". You can call it anywhere on the map, you can either do a regular airstrike or a napalm strike.
Its in the editor section and it would probably be easier to change that one.