Well, I type in short words...
Well, if you want it full:
If you just change the damage of the nuke to 0. The game will still end, because the nuke is ment to end the game.
It would be wird if you could play after the map got nuked. (That would be a EPIC fail from the produsers.)
So what I said: You have to get the FX for the nuke, or you have to go into the nuke.gsc (That I don't remember if exsist. Look in the GSC RIP Collection)
And change so the nuke won't end the game when the nuke have been used.
You understand it now?
Now you can read more. Instead of short told answer.
Ahh I get what you're saying. That's what I was thinking too when I read this. The nuke ends the game not just kills people.