Want to use MacBook Pro as Wireless AP: Utility to increase security?

[Sam2k]

I have a MacBook Pro receiving internet over ethernet that I would like to use as a Wireless Access Point. I know that this can be easily accomplished in system preferences under sharing. I am looking for some kind of app or utility that will do the same thing but also has additional security features like those normally found on a router. Specifically, I want to be able to turn SSID broadcasting off and enable MAC address filtering. If anyone has any suggestions, I would be most appreciative. Thanks.