This is a custom version so if you don't know what your doing : Stop here.
NOTA : I really mean it : DO A BACKUP FIRST ! You'll need it when you'll want to upgrade to the next official version.
How to Install :
- Upgrade your subsonic to at least 4.5beta2
- Stop your subsonic server (sudo /etc/init.d/subsonic stop)
replace the "jsp" and "classes" folders from /var/subsonic/jetty/<some mumbers>/webapp/WEB-INF/ with the ones provided in subsonic-gt.zip
- Relaunch subsonic (sudo /etc/init.d/subsonic start)
After that you can go to settings/network and enter the subsonic url you want to use for sharing

Modified Files (4.6final) :
subsonic-gt.zip
Sources