Comment 11 for bug 895972

Is it possible to add Multifire as an option just for the generic warhead?
I imagine it would be quite simple to check for GenericWarhead.Multifire=yes and apply the same GW operations for each building that has the same super weapon.

At least while multiple buildings of the same type only ever create a single SW. But even if automatic multi-instance SWs are added in future, having GenericWarhead.Multifire=yes and MultiInstance=yes on the same SW would just make it uber powerful - it wouldn't actually break anything.