Current questions and answers regarding the map editor.

3) Check the "Creating NPCs from monsters" section; the function is called SetMonsterSelectionMode.
4) Yes, the game will refer to the hero whose AdvMapHero file comes later in the list of map objects. For multiplayer, it is recommended to make copies of the heroes, separating them into "HeroName1" for the first player and "HeroName2" for the second player.