In my experience, while it's scanning, they are added without much effort to sort them.

Once scanning completes, they all sort, primarily keyed by remembered/not remembered (and presumably BT in the middle, but I haven't got that) and secondarily by signal strength.

There may also be something about ad-hoc vs. infrastructure...

The main trouble is a basic design problem: you could insert new APs in sorted order, but then someone scrolling through the list might miss some. You could leave them in order of detection, but then if you let it finish scanning and try to find the one (out of dozens, in spots) that you want, you have no way of quickly finding it. What is the best course of action? I don't know, but I'm inclined to suppose that a larger window and smaller font would go farther than an improvement of any other single aspect.