This feature if added would bring that excitement and fast paced action feel to guild wars that I feel it is lacking at the moment that would help to propel the game to a new level having this option would not break the game in any way in my opinion because of the fact that the use would have their cursor locked to a position in front of their character. While the people that used this would have to face where they wanted to cast something, people that play without this will be able to cast AOE spells off to the sides and all that as long as its in range giving an advantage above the people that want this to enhance the action feel of the game..