custom firewall configuration

[Romeo Theriault <romeotheriault gmail com>]

The built-in RedHat firewall has been working good but it isn't  
meeting our needs anymore. I would like to customize it to make it a  
little more secure. What is the appropriate way to do this. Do I just  
turn it off and create my own init.d scripts? The /etc/sysconfig/ 
iptables files has a line about not recommending editing it? So what  
is the recommended way of further editing the firewall?

Thank you,

Romeo Theriault