http://ofbiz.116.s1.nabble.com/Users-Configuration-of-Url-tp138751p138754.html
That would be one way... But you can also change the mount point of the ControlServlet in the web.xml file and all dynamically generated URLs (ie using the ofbizUrl tag) will pick it up automatically. Quite a few OFBiz-based ecommerce sites do this.