There seems to be a new convention around to include .srr files with releases (
edited)
These files allow to reconstruct the original scene release fileset from the extracted content together with the .srr file. More information can be found here
http://rescene.info/ .
However, I extract files to a different directory, and want the old one to be deleted. At the moment I created a custom rule to move *.srr files to the new folder aswell, but a new rule to delete them like *.sfv files and *.md5 files would be a lot nicer.