Problem is that blowing up everything within 5 miles radius kills any computer on earth. Standard Fx needs to be replaced by something lighter yet representative of a nuclear explosion. The script-only solution is something that even a modder can do. But from ED, I would expect something *slighty* more elaborate.
At some point, they will have to implement some special FX for big bombs - thermobaric, napalm... - and nuclear mushrooms is kind of the same, just bigger
Regards!