May I suggest a very helpful, super simple to implement, feature?
Problem: Sorting (ascending order) a single select that has empty values puts all the empties up front. Work around: Reverse the single select options order (put 1st at bottom), but this is a pain. Suggestion: You already have “Alphabetize” in Single or Multi Select, which sorts A-Z. Please enable a 2nd click to then sort Z-A. Voila! Now sort my view Descending and my empties will be at the bottom and my single selects will sort in the view correctly.
A better, more intuitive solution might be to provide a switch in Sort dialog: “Sort empties at top/bottom”.