Thanks, I'm both relieved (that I didn't overlook something) and disappointed (that it is not two position stop but the position of the driver at half open does not appear to be the most useful).
Indeed, my large flat head has a stripper notch and the 1/4" has the half open stop.
I have thought about selling this tool mostly due to the size but after reading more of the forum, I am interested in the idea of customizing the tool to my needs.
Thanks again for the reply about the second position stop.