Do you need more features? If so, then you may want to try open-source RouterTech firmware. This thread shows how one person has managed to achieve that goal. This thread shows how the RouterTech team have managed to achieve the same goal. Your mileage may vary. Do NOT try this if you are afraid of bricking your WAG200G or don't know how to install and use JTAG unless you are prepared to throw your router in the bin.