Why is it not possible to show shipping costs on the confirm order page without changing the kernel code?? Is it not customary to show shipping costs on this page? I can't see any calls to shipping functions, and I think I have checked the latest ez version. This is also an issue on the orderview page. Hope someone has an answer.
You should take a look at this extension that Brookins Consulting released http://projects.ez.no/bcstaticshipping. It is a variation of the one we had Xrow develop for one of our clients that will be released under the http://projects.ez.no/xrowecommerce. You can see it in action at http://alconeco.com.