It would be useful for both the standard stylesheets and the website stylesheets if the method to add stylesheet links to the head element could be extended to handle multiple stylesheets with media, rel and title additions.
i.e. if there was a parameter like the 'generate.toc' parameter with four columns
./css/main.css nop nop nop
./css/custom.css print,aural alternate nop
where 'nop' does not output the attribute on the link element.