Emotions through heat? Euh, I'm not sure I have ever thought heat could emanate emotions. It could maybe create some activity in the brain, but otherwise I don't think that it could actually lead to undesrtanding someone's fellings.
Heat as in creating fire is absolutely accepted as a power for one who is adpet to this element. Heating any kind of substance is a basic power. As long as it's not a power that can overpower everyone else, I think adding a few powers to each and everyone would be okay, thout please ask me beforehand before changing anything to your characters.
And about whereyou are on the map, I'd prefer you edit on the map where you are, upload the image on your personal AO file space and put a link here that I'd then take and edit in the master map