I agree that the camera software should just let you pick any shutter speed, but you can get a pretty cheap remote button or intervalometer for <$30, or even DIY one for cheaper. What does the $160 canon button give you that a cheaper version doesn't?
The cheaper ones don't come with a timer, do they? Besides, it's not that I haven't found a solution (Magic Lantern lets me set the speed to however long I want), but I dislike the gesture. It's obvious that they're gating features so they can release them in the next model.
