No need to depress the throttle pedal during cranking. The governor on the Stanadyne pump is designed such that the pump moves to the full fuel position while cranking regardless of what your foot on the gas pedal is doing.
Think of it this way: as soon as the pump starts turning, the governor weights go to full fuel until the engine speed matches the governor setting. O foot position = 700 rpm. If the actual engine speed is below 700 rpm, like in cranking mode, the governor advances the fuel setting automatically until the set 700 rpm set point is reached.
I know it's supposed to work that way(logically, it does, based on how the insides of the pump work).
In reality, however, I've seen a lot less fuel coming out the lines with the throttle at idle when cranking. I don't know if it's due to timing, allowing the ports to line up better, or that the metering valve doesn't always move to full fuel, but I've proven this in practice multiple times.
It may also only apply with air inside the IP; I couldn't say for certain. What I do know, however, is that bleeding of lines takes a lot less time if I keep the throttle floored when doing so, vs at idle.
I will also point out that I've seen a couple Stanadyne DB2 calibration sheets for various pumps. At the low end(cranking volume) I see "WOT" for throttle position... so perhaps there is a reason?