Mediation to the Gustav Mortar

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?

I've been toying with the idea of a Heavy Mortar shell call in with damage similar to that of a V1. You can only imagine how big the explosion from a HE 800mm shell is, I would think it was similar to a V1, but it could be bigger.

Yeah..it would be interesting.

make it some thing that takes pop cap to have, seems to be the biggest limitation on things like howitzer spam and such. make it around 20 or 21 pop ish and that may solve part of it if it were to be reuseable

The Gustav Mortar wouldn't be a unit, it would be an ability, a super-weapon similar to the V1. You wouldn't be able to spam it since it would have a massive cool down and a massive cost. Upside is, you wouldn't hear it coming... it would just be BOOM, holy shit. ;)

i know it not a unit but i mean as an aditional limitation like if you use it you loose 10 pop for 10 min or something

How will you mod this limitation ?
I think it will be closer to the Jagdtiger, just one .