I think there is no way to automatically update the vpn client profile. This is something that needs to be configured on each pc or for each profile. However you could create a connection on your vpn client and get the pcf file under Program Files/Cisco Systems/VPN Client/profiles and copy the profile. Then you could either replace this file on your customers PCs through VNC or a similar program; or you could send this file to your customers and make then replace their file on Program Files/Cisco Systems/VPN Client/profiles if you do not want them to modify the actual connection.
