Another point I would like to bring to you attention gentlemen.. .. .The doors, in most light Aircraft are playing a role in the strength of your fuselage (when Airborne). .. .Therefore, I am not sure it's in somebody's interest to degrade the integrity of your hull prior an emergency landing .. .. .If you think about it :. .. .1) Engine failure (good start for the day). .2) incorrect approach on the glide path (makes you a bit nervous). .3) Weird Idea to use your doors as speedbrakes. .4) Spin because of incorrect use of the so-called Speedbrake. .5)Crash, nearby a perfect landing spot. .. .Not a good day.