Is there a simple way to identify current PPTP roadwarrior and possibly IPSEC VP{N connections - plus length of connection etc.- within the Webadmin interface?
I am not sure if this works for PPTP, but if you just go to the "Connections" page for IPSec VPN, you can look at the section called "VPN Routes". There should be a route for each VPN connection that is currently connected. If you assign virtual IPs, or if you know what source IPs users have, then you can probably identify the tunnel, but the routes will not show you which remote keys were used.
I am not sure if this works for PPTP, but if you just go to the "Connections" page for IPSec VPN, you can look at the section called "VPN Routes". There should be a route for each VPN connection that is currently connected. If you assign virtual IPs, or if you know what source IPs users have, then you can probably identify the tunnel, but the routes will not show you which remote keys were used.