Thanks for the answers, and I found a very interesting old map called "Refugee" and played it a bit =)
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a) SetHeroCombatScript(heroname, script) – does this mean it applies a combat trigger to your hero for the rest of their life? Because I have a hero with a combat trigger as the main one, so even if he dies, it will still be loooooose, so if I apply it once at the beginning of the game, that's what I need.
b) Regarding 'combat-common.lua', I still couldn't find any explanations in that thread. What exactly is considered "a few lines"? I would like more details, if possible.