Demantra PTP/DSM Internet Access

Is anyone providing access to Demantra PTP and/or DSM over the Internet?  We have many users who are not on our coporate network and for whom we need to provide access.  We are currently accomplishing this via Citrix, but this is not optimal.  Performance through Citrix is poor for some functionality.  We are hesitant to set up all of these users with VPN access and I am wondering if anyone has any suggestions for ensuring the security of the Demantra application while allowing authenticated users access.  We are running Demantra on Weblogic AS.

Thanks,

Kevin