It annoyed me to death that the wireless interface was bridged to the wired interface. I would much prefer to keep my NFS mounts local to my wired ethernet. Luckily openwrt lets you break the bridge and do just that so things are “normal.” This is covered in the openWRT FAQ.
Unless you are sure you probably don”t want to change the wan_* settings. Specifically setting the wan_proto to static is probably not wise as then you will not acquire an IP address from your provider.