If you have time, I used to sit in my car while the alignment guy adjusted the height and alignment.
That was along time ago and people didn't sue shops for breathing on there cars so it may not be an option now.
If he isn't used to old school T-Bars, make sure he knows to loosen the LCA pivot Stud before he adjusts the height and tightens it afterwards. You don't want to leave the bushing in a bind at ride height.
I actually will be sitting in the car. I am disabled from a wreck years ago, and rather than bring my wheelchair along this shop is one that I have a good rapport with and they are fine with me hanging out in the car for most repairs and service.
I agree, that having the driver in the vehicle makes a difference in setting the heights and alignment. Did it for me other vehicle and it was incredible how much difference it made, alignment was right on first time out, no fine tuning needed.