NetworkManager: how to add own default route

[Mail Llists]

  How do you put in a default route in nm-applet ?

  The routes window does not accept the word default and it wont take
0.0.0.0 with netmask of 0.0.0.0 ?
 
  Instead of the ip/mask as the input it would be sure nice if you could
enter the standard commands that go with ip route ... with variables
such as  $TUN for the vpn tunnel device for example.
  
   Thanks.