I didn't know [link|http://www.fokus.gmd.de/research/cc/glone/employees/joerg.schilling/private/cdrecord.html"|cdrecord] ran under cygwin. Apparently it does. There are links to windows binaries for this command line program at the bottom of the page.

Now you just need a command line ISO image maker like mkisofs. Wrap it all in a batch file.