Adding a toggle, or other method of controling, the death storm is in its self not a bad idea, in fact its something I am favor of happening. The storm always has been a secndary feature to the Ythotha so a minor buff to it wouldnt be a big change.
However, I must say the reasoning provided in this thread for adding such a feature is... lacking. I do not want to be rude in any way, its just a simple fact there is no situation in a normal game (well, unless someone was hardcore goofing aorund) where you would actually end up fighting off 10 EXPs at once, the mass investment and time investment in such a thing is absurd, and more importatntly, is mass and time that could have been spent on much better alternatives such as game enders, arty, nukes, telesnipes, strat bombers ect. Speaking of nukes, from scratch you could build two nuke silos and load them both for a total mass cost of less than two GCs but with enough firepower to one shot a group of twenty GCs.
Now to talk about the elephant in the room, as I said just before, that is in a normal game. But if your playing a game that has heavy unit restrictions and/or encourages concentraited t4 spam, then yes you could end up in this situation, I would know, I have actually been in that same situation. Its not fun knowing that any atempt to attack the enemy will end up in your semy self destructing. But as much as it sucks, its nearly impossable to properly balance that kind of game anyway, not without causeing damage to the balance of other game modes.