are you suggesting that only teachers from Edmonton cannot get multiple entries?
Nope. Merely mentioning that folk in other parts of the world certainly can! Those in the know would have told you that the UK, Australia and USA are "friendlier" than Canada in terms of dishing out non-Imm-B visas. But that is quite irrelevant to you, however others may find the info useful

I am sure that you are aware that the rules change from consulate to consulate and even from day to day. Have you checked out the thread on converting a tourist visa to a non-imm-B visa - that seems to be a very doable course of action for those with problems getting a non-imm-B the old way.
http://www.teflwatch.org/forum/index.php/topic,335.0.html