Another power adjustment idea for AF guns

I don’t know if this is the right section to post this but an idea came to me while I was looking at power adjustment method of the non-AF guns.

Since the breech block/slide is basically a hollow tube between the air valve and the pellet, there may be enough room (next to the cocking knob?) to install an adjusting screw that protrude into that port to slow down the air flow. It won’t reduce air consumption (hence increase shot count) like changing the transfer port size of the valve stem or adjusting the top hat but wouldn’t it be very convenient to adjust velocity on the run?

Appreciate your comments as always.