SPWW2 handicaps vs AI

[Mobhack]

And the only people who could possibly be objecting to it are those who play other humans in PBEM.

In which case, you can discuss the (to you) over use of the feature via email, and if necessary simply stop playing against someone who you think is always "going large" with too much direct area fire. Just like say, someone who always plays with a gazillion snipers, or whatever you feel is wrong. And if it's a PBEM league, then the organisers can set out (or be lobbied with to do so) acceptable ground rules like say "only a dozen bursts of Z-fire a turn is acceptable use".

Because its a human-only feature, limiting it lies in the human sphere. I think everyone could agree that letting loose with 200 unit's worth of Z-fire for 4-6 bursts per unit, each and every turn is being a bit unsportsmanlike. If that is happening, then talk to your opponent about some ground rules. Simples.