Sounds like the same two levers to me, throttle and motion. Not sure why your set up would allow you to set and forget, it would seem the throttle on any hammer would be a great advantage in the control?
As far as the air consumption, your calculations use the dimensions of my hammer which determine I am almost 100 cfm short. I have yet to run out of air running wide open but I do have a large air reserve.
This is most asked question about these types of machines (answered in this thread several times by myself) I believe you have the ability to run them on short air supply depending on the process. I have been running my 200 on 7-1/2 hp. air compressor with the control valve hooked up to a treadle, I have had plenty of air for top tooling.