I love the new clientside druid shifting... to put it bluntly it's FREAKING AWESOME, and it's what the druid community has desired for a long time. Most of us are using macros still to do swiftshifting, I dont even have my stancebar up. The problem I'm seeing with /cancelform is that for it to keep you from shifting back into the form you're in I.E.

/cancelform
/cast Dire Bear Form

Will just shift you back into bear when you click it. Is there anyway Blizz can set this to work without using a modifier. The best I've come up with is:

/cancelform
/stopmacro [modifier] or [button:2] whichever you want.
/cast Dire Bear Form

Great explanation, Cogwheel.