[Imp]

Its more the players that are at fault when it comes to choosing who Z fires, LOS is fairly restrictive to what you can Z fire at.
Improving would probably take serious work. Other serious work option as people liken it to artillery would be to plot them all at the start of the turn on a bombardment screen. Press go & all Z fire occurs no more allowed that turn.
Takes it out of players hands to an extent as you cant see the result & stop.