Natd question

Hello everyone,
I'm having trouble understanding how to set up the startup options for the natd daemon. Let me explain myself. I recently found out how to enable port forwarding in a quite easy way, that is writing my port_redirect rules into a conf file, killing natd and reloading it with the -f option at the end pointing to that conf file. This way I'm able to achieve Open status (instead of Moderate) in the XBox Live connection tests on my XBox 360, which is connected to the internet through the shared airport connection of my Macbook.
The fact is that natd seems to restart itself with its default settings every now and then, thus "downgrading" me back to a Moderate NAT status, which is not good enough for me. My question is: since the only thing that I add to the natd command (which is /usr/sbin/natd -alias_address 192.168.2.140 -interface en1 -use_sockets -same_ports -unregistered_only -dynamic -clamp_mss -enable_natportmap -natportmap_interface en0) is a -f flag, is there a way to set this custom flag to be loaded with the default settings?
I googled around and found out that Leopard handles its startup items such as daemons and agents differently, and all is handled through the launchd command. I haven't been able, though, to find which is the plist in /System/Library/LaunchDaemons that defines the options for the natd daemon.
Thanks in advance for your help,
Cheers,
Juan

Up...

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    See "error -3259" here.

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    dns-server none
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    vpn-filter none
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    password-storage disable
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    group-lock none
    pfs disable
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    split-tunnel-policy tunnelall
    split-tunnel-network-list none
    default-domain none
    split-dns none
    intercept-dhcp 255.255.255.255 disable
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    user-authentication-idle-timeout 30
    ip-phone-bypass disable
    leap-bypass disable
    nem disable
    backup-servers keep-client-config
    msie-proxy server none
    msie-proxy method no-modify
    msie-proxy except-list none
    msie-proxy local-bypass disable
    nac disable
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    address-pools none
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      homepage none
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      http-comp gzip
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      url-list none
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      port-forward-name value Application Access
      sso-server none
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      svc keep-installer installed
      svc keepalive none
      svc rekey time none
      svc rekey method none
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    username xxx attributes
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    Cryptochecksum:a4dfbb82008f78756fe4c7d029871ec1
    : end
    ciscoasa#                           

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