It would be nice to allow users to be able to configure advanced features on the router like DHCP server configuration, MAC filtering, etc.
I just looked at my settings, and I can do MAC filtering, etc under the Advanced Setup function of my router. It has firmware version 31.122L.13, just in case you want to check yours out.
It looks liek @myotherbrotherdarryl has kindly offered up some great advice. Let us know if you have any other questions!