This change makes it easier for people to update as there are less files in the root besides other advantages codewise. Besides that all rss feeds had always these extra parameters to call different things (all comnents, comments of an image or album etc).
You could have just used a standard theme and look what links it generates. You actually had only to change your hteme to use the right function.
`?rss-comments&id=?&type=?rss-comments&type=gallery&lang=en_US`
You did not really look at the link generated, did you? It should of course be:
`?rss-comments&type=gallery&lang=en_US` (while lang is optional if you use en_US anyway).