I would like a function added to par2cmdline to simply list the files covered by a PAR2 file. Similar to the verification list, but without the verification; simply parse the PAR2 file and show what files it WOULD check/recover. This would provide the ability for script writers (perl, python, ruby, etc) a quick way to see what is there without having to write a native block parser in their language.
I wrote a Ruby version. I've also written an infrastructure to handle all PAR2 file packets but only do the file descriptor ones.
http://blog.revragnarok.com/blog/blog/rubypar2