is in your roadmap implementation of Aventail SonicWall vpn client ?
This client doesn't have its own executable file to open interface and setup connection parameters, but must run following cli command:
C:\Windows\system32\ngdial.exe "Aventail VPN Connection" username * -server=vpn.vpn.com -login=VPN -status=enable -icon=enable -gui
"Aventail VPN Connection" is the name on windows control panel network connections page
username= vpn username
*= password (is possible to explicitly write it)
login= the group to which the user belongs
Here you can download client installation package.
This will be simple to add. I will make sure to have this on our roadmap for the end of the month.