My dad and I hunted from a Coleman canoe for years. We would wait for the ponds to freeze, forcing the ducks onto the river. We would then sneak around the bends and jump shoot them. We took turns with the one in the front doing the shooting. Since the recoil is more or less in line with the long axis of the boat, we didn't notice any instability. As an adult, I've used an Old Town 16'9" Discovery to access backwoods swamps, pulling it into the bushes and hiding it with brush.
To a much greater extent than most mechanical devices, firearms are terribly unforgiving of any overconfidence, complacency or negligence.