You want no spawntime in you singleplayer game?
# Solution 1:
Start your game, open console (~) and type:
sv.spawntime 0
You have to do this everytime your game starts
# Solution 2:
Open gamelogicinit.con and add
sv.spawntime 0
to the end of the file
You may also want to change 0 to 1, as 0 gives (really) instant spawn, which may be irritating.
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Or do you want to remove the spawnwave feature?
In this case go to mods/fh2/python/game/ and open gameplayPlugin.py with Notepad.
Find:
standard = 'tankDisable aiFixups limitKitNCO artillery commanderChair artilleryReload parachute awards deployables spawnwave'.split()
(line 26)
Change to:
standard = 'tankDisable aiFixups limitKitNCO artillery commanderChair artilleryReload parachute awards deployables'.split()
All of above are multiplayer-friendly (you don't have to revert the changes to join multi game), but not fh2-patcher friendly (you will have to download full install next release).