Update: I have completed the major rewrite of this mod and have it functioning perfectly in my local test site. I next need to transfer it to my live site and ensure that it works there, do some more overhaul of the readme, and then it will be ready for release. I can package it soon for anyone who would like to test it and give feedback before official release. It works on v1.5.0 and v1.5.1, and I know of no reason it should not work on v1.5.3 (I will test this before release).

The new version has all new code except for the actual download/save functionality, and allows you to select a range of days ago, from/to dates, or from/to order ids, and then the original choice of download styles, plus the ability to download all of any one order status within the specified range. You can set in the defines the fields to export and their order in the file. The tab-delimited file will have customizable field titles, and basic info like customer name, date, etc. only appears once for orders with multiple products or attributes. Total cost and order comments can be included in the output, and other fields can be added by following the format of existing ones.