The renaming feature puts a number at the end before the extension (When I need to add multi-index downloads). In sequentially ordered downloads with identical filenames (image or video filenames especially), this is annoying; because it mixes together the files of various photo or video sets instead of listing them sequentially and subsorting them properly.
I think that user should be able to place a new renaming mask maybe *seq* for sequence. This mask is a number from 1 to however many files are requested in the download set is. Say if the set has > 9 files then it begins with 01. If the set is > 99 then it begins with 001, etc., so that 10 wont be sequentially ordered before 2 in the picture viewer.
So,
*num*_*name*.*ext*
becomes:
*num*_*seq*_*name*.*ext*