I would love to see this implemented as a feature as well. It is so difficult to change the order of categories. It takes hours and is so slow, tedious, prone to mistakes cause of how the arrows work, etc.
I’d also like to see the ability to just automatically alphabetize the subcategories under a category, and then after it is alphabetized, move a few if needed (not every category is appropriate for alphabetization, but allowing alphabetization makes the job so much easier and then some adjustments can be made manually).