[Mods] modifying 'friendly fire'

i'm curious if it is possible/how to change unit attack behavior so that they damage all units - not only Enemy units,

similar to 'onager line'/BBC shot. Is it unit /dead unit/arrow property

Let me know if it is possible for any of these:

1. Trebuchet
2. Battering ram
3. Demolition ship
4. Petard
5. War elephant, battle elephant
6. Goat
7. less important: UTs for Brits/Slavs related to 'area-effect'

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I prefer AdvGenieEditor, but up-effect, up-attribute, up-whatever based sugestions are also welcomed