What if they allowed an A-Bomb, but only let players blow-up some an un-inhabited island on the map, to demonstrate it's power?
Then all the others that didn't have the bomb might consider surrendering.
That would be pretty cool.
But seriously, if a country could pool it's resources and work as a team, capture certain bases (and certain number of bases) with needed technology and parts, and eventually be able to aquire one bomb as a country.....that would be cool! Even after getting one bomb, you would have to coordinate a bomber and protect it to deliver the load. Maybe have the highest ranking players online at the time be in control of the bomb.
Think about it.... if it took that much effort to get one bomb, then that one bomb could wipe out a few bases all at once and maybe win a reset, would it be that terrible to have? Remember, the WWII A-Bombs only had a physical devestation radius of maybe 1.5 square miles IIRC.
I think it would probably be a cool thing, but then again I could see it becoming the whole focus of the game also.