I, too, have looked at the interior door hand screws of the IV and ES and thought it was a dumb design.  Here's what I did to minimize the chance of failure:  First, recognize that a flat-head screw is the wrong thing to use in this application.  The screw is loaded in pure shear and the wedging effect of the screw head tends to create a bending load.  But it's too late to go to a round-head screw.  Also, the tension in the screw adds unnecessarily to the total stress.  Given that, I put Loctite on the threads and then just tightened the screw snug - essentially no torque.  All screw torque can do in this case is keep the screw from loosening, and the Loctite will do that without adding stress.  And I added an interior release to the (enlarged) baggage door just in case.   Mine hasn't yet broken, but now that I've said it out loud, it will break the next time I try to get out!

Gary Casey