I know I can disable friendly fire with

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--FRIENDLY FIRE ON TURRET
addhook("objectdamage","turretDamageFriendly")
function turretDamageFriendly(oid,damage,player)
if damage > 0 then --if damage is higher than 0
if object(oid,"type") == 7 then --if dyn. object id is 7 (turret)
if player(id,"team") == 2 then --if it is CT player damaging
return 1 --don't damage building
end
end
end
end