I think having the ability to sort the folders would help to manage those who have a large number of folders or add from time to time.
e.g. I am one of them.
Although it seems like a pretty good idea, I think the process should be kept simple.
In my opinion, all that is needed is to sort only the subfolders/subdocuments/subitems from the corresponding selection. The reason is that I don't think that at some point and then the changes will be frequent.
Either way the decision is yours.
Thank you for the response.