It would be very usefull to see the bandwith and the services used (TCP/UDP ports) for each VPN tunnel. That would help to know each tunnel consumption and keep an eye on who is using more than he should!!
This feature was implemented in XG Firewall
Very usefull feature I think
This feature is planned for the UTM 9.2 release later in 2013. Stay tuned.
It would be great to add this feature to help us search logs by a time range like from 10H to 11H (for example)