Thanks for your advice about the dutchman. I will hire someone to do the carpentry for this one! But in order for me to get a better idea of what should happen, would you please elaborate on what you mean by "45 degree cuts toward the strike plate"? This depends on which way you face the door jamb. First, the options when you face the strike plate (right shoulder is outside and left shoulder is inside the house): 1. two // cuts (one above and one below) 2. two \ cuts (one above and one below) 3. one / cut above and one cut below 4. one cut above and one / cut below Seems to me that option 3 is best, creating a wedge to best guard against someone kicking the door in.
Or, do you mean facing the door jamb from the inside of the house (both shoulders inside the house, you are looking at the door jamb). Same options: 1. two // cuts 2. two \ cuts 3. one / cut above and one cut below 4. one cut above and one / cut below Seems to me that all of these options are less secure than #3 above. Force on the outside of the door would cause the new "section" to "slip" out.