In all my private pilot flght training I have never heard an instructor suggest slowing to a stall speed and jumping out of the plane as one of the possible actions to take during a ditch.

All instructors I've flown with said to FLY (not ride) it down.

In the piper warrior, the instructors have always said to "crack the door" and wedge something in it if you can (the door opens against the airstream), so that the door cannot be jammed when you crash.

I do knot know of any small 2 - 6 seats private airplane that has the ability for the doors to be jettisoned.