There's been a lot of talk about this. That it might make the game overpowered. I agree, but i have some idea's to mediate it.
First, there was the idea of using the less-explosive round.(forget what it is exactly, but not a bad idea)
I was thinking, how about you make it a little stronger than the v1, but can only use it once? Perhaps make it somewhat inaccurate inside the area you call it in.
Make it part of a Propaganda doctrine of some sort, at the cost of 200 munies and 3-4 CP?