I presume, then, that there is a lot of interest in adding the ability to re-order the not-ordered list? Or in creating some other way to get around this limitation?

Good news: there is a work-around that I've found with some googling since I first posted this. Selecting, cutting, and re-pasting objects appears to be a way to change their effective entry chronology and, therefore, the 2D visual "stacking order." It's been working for me so far...