My initial suggestion would be to be able to cancel it by right clic. The only problem with that would be if someone want to right clic to turn in another direction while have the ground aoe circle displayed. If someone have a better alternative, plz suggest it.
(edited) this also could be used to cancel the casting time of all the skills, instead of press the ESC key.
Edited by Nadesh, 11 May 2011 - 08:01 AM.