I had not wanted to Sort the list or keep it sorted but it is a rather arcane way to drag and drop from my experiences in Windows and Linux - I have both.
It still remains that the unit list for the city is very difficult to use if you have an accumulation of units.
By not being able to specify a load sequence the LOAD ALWAYS picks up AA, Artillery FIRST. It would be more appropriate to have the load function load infantry, armor, engineers, Seabees first rather than AA, Artillery that I usually want to leave in a city for defense. From my perspective, if this is always going to be the way LOAD works, that button and keystroke are useless in my play. Perhaps some compromise could be reached?