a) mouse move on the far right (past the border) of the map makes you move to the left side of the map.
b) targetted spells cast (not sure if targetted AOE spells are affected) that are targetted over the edge of the map (if there is nothing in the way) will stop and stay at the edge of the map, walking over them sets them off, meaning you can make an uber powerful bomb
that is all that I can think of right now that relates to my topic