Specify Public IP per User
If the data logging of what URL's and activity a user/vpn connection has done during it's session isn't possible.
Then another option for me would be the ability to specify a dedicated IP per user, so they don't all share the same public IP.
So then when viewing logs in websites, we could see a dedicated IP per user and track who did what.
Why do you use a VPN connection, when you want personal trackable via single (static) IP?