[jp10]

I never encountered a situation where a sub-unit would 'Recon by Fire' or apply 'covering' or 'suppression fire' without approval/coordination by their higher command. Even if it was just a nearby Platoon Leader yelling 'shoot the wood line'. Along with the noted slowing of offensive 'tempo' of an action by employment by such a technique...

What if z-fire:

1. Uses 2x movement per shot.
2. Unit has to be 'In Contact'.
3. Adds a point or two of suppression to the firing unit.

This would reduce the total individual amount of Z-Fires while reflecting some of the complications of utilizing this technique. While seeming to be more a PBEM issue it would also lessen a bit of the Human advantage over the AI in regards to Z-Fire.
It would help make Z-fire something you have to do in certain situations, not something you would prefer to do, much like a real world area fire.