I have set up presets for the head diameters and depth (manually entering them and saving them as presets even though the diameter and depth are standard and really should auto populate when I select a 1/2 -13 SHCS ), however if I specify a 1/2 13 thread it makes the hole diameter .5 (not .5 plus clearance also I have to look up the clearance diameters in another program (g wizard) or google it and it does not seem to be editable even though it is obviously doable since you can select pitch diameter , tap diameter ,major and minor but not clearance.