Ok here goes:
1.) Sorry. I have no idea. What you can do is make a battle event where it says for the trigger "If this many turns passes" or "If Hero's health get's between 0% and 25% (just an example)" make a common event where it gives you a new battle command like "Limit Break" or "Hi-Ougi" and then when you use the command, it gets rid of it. And it restores your health or something.
2.) Yes, where you want the hero's name to go you type \n[ # ] in place of the # you put a number. This number is whatever number the hero's number is in the database section "Hero" So look there and say if Cloud is number 3 type \n [3] (dont put a space btwn \n and [3]) and it'll say, for instance, "Cloud: Hiya ppls!"
But another thing is, why would you want to do that when you got facesets? No offense meant btw.
3.) There is a way, if you mean like if you go off the East side of the map and somehow end up on the West side. What you do is make the World Map map, or maps, and set the map, or maps, in Map Properties (which you get to by right clicking on the map's name and clicking map properties) and where it says "Wrapping" set it to both. This way, if you go north, past the map border, you'll end up at the bottom. Setting it to Horizontal would mean if you go East you would end up on the west side of the map, but this wouldn't make it so you go north and up up at the bottom. Vertical is the opposite of horizontal, obviously.
Phew.... There ya go. Hope it helped!