4. Is it possible to add new battles at new locations on the map, or to add new story battles?
You stated you've seen Jot5, so how do you not know the answer to this?
6. I've seen battles in JoT5 begin with units mounted on chocobos - how do I do this?
Event Editing, Emmy explained it just fine
7. Is it possible to add battles on the unused maps in the game, or to import WOTL maps?
WotL didn't have any maps that weren't in the original game
8. I know that effect animations can be modified out of game, but is it possible to switch palettes for an animation (without having to replace it), such that I could have, say, a yellow stasis sword (while keeping the original blue available)?
Xifanie's ISO Manager