Metric is a term in this case, describing the attributes of something. One finger steering is 100% bullshit put out there by the aftermarket steering companies to sell steering. How easy it is to turn in the cab has nothing to do with how much power the system has to turn the tires.
If you contemplate a backhoe and the control levers, the operator has no sensory feedback into them to tell him how hard the bucket is working. Steering can be done the same way but sensory feedback is wonderful so the steering "feel" is determined by the torsion bar not the system power. A light torsion bar in the steering gear makes it very easy to turn or 1 finger steering. It also sucks to drive on the highway since the steering requires constant input and comes across as twitchy. The solution is to use a larger torsion bar for heavier steering "feel" that makes it far more comfortable to drive at speed and affects no downstream power since they really have no correlation.
FYI, with that pump, if you hold it in bypass very long, (that squeal you hear is bypass) you will bow the cap on the steering gear and puke the seal out. Second FYI- you can put it in bypass with tires straight ahead if they are in a spot where they can't turn.
PSC does not warranty a puked cap seal because they didn't fuck it up, you did.
Third FYI- every 5 seconds in bypass heats the fluid up about 50 degrees. That is due to the pump circulating the same fluid internally since there is no method to circulate it back to the reservoir in bypass. About the same as taking an auto tow rig and trying to get up a hill in first with a big load. You can watch the trans temp go berserk due to all the torque converter slippage being very mean to the fluid.