your beastie.4th modification sets the boot env variable 'sysctl_var' to the value 4. you can get the value of your boot variable from netif.sh using kenv - please see my earlier post.
all you now need to do now is add 3 more menu items to beastie.4th each of which sets a different value of sysctl_var. then modify your netif or add your own rc script to setup your network based on this value.
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