Dropfiles module should add subfolders automatically

At the moment, when we create e new subfolder we always need not to forget to add this new subfolder to the selected folders in the module. If we do not so, Downloads from the new folder will not be shown in the frontend.

Therefore it would be very useful when creating a new subfolder in dropfiles, that this new folder would be added automatically als "chosen" in the module. (In the module we have set to show one folder including all subfolders)