A new release is coming next week, including the fix for JBWS-3048: http://lists.jboss.org/pipermail/jbossws-dev/2010-June/002100.html
Regarding the way the installation is performed, simply extracting a zip would now work; one of the reasons is that, depending on the WS/AS versions, some files need to be removed without being overwritten. Hence the requirement for an actual installation script.