Open WRT separate 2nd WAN + Load balancing

This post explained what I really need: http://www.dd-wrt.com/wiki/index.php/Switched_Ports#Second_WAN_port

Second WAN Port:

nvram set vlan0ports="1 2 3 5*" 
nvram set vlan1ports="0 4 5" 
nvram commit 
reboot

Then apply multi WAN 

http://wiki.openwrt.org/doc/howto/mwan3