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, dividing them into "HeroName1" for the first player and "HeroName2" for the second player.
3) I found the section; I did see it in the instructions when I was browsing, but I had the (false) impression that it was on the forum. It's titled "How to perform an action when touching a specific monster." Thanks again for the tip! I think I can figure out the rest from here; the map will visually improve, and I'm planning to use this to create a retraining mechanic for humans using these NPCs. I was wondering what object to use.
And additionally, another question. The FAQ on the map editor, Volume I, is a great guide to the editor, and it's your work. I've taken the information from it to heart. I didn't find Volume II; does it exist, or is it planned?