Suggestion for Chapter 33 (firewalls) in FreeBSD handbook

I think that the "if firewall_type...configuration of the system" line in 
Chapter 33 of the Handbook under IPFW is confusing because it makes it seem 
like only the "client" or "simple" IPFW presets can be modified by the rules 
specified in /etc/rc.firewall. There is nothing mentioning that, for example, 
inbound ssh connections can be allowed on the workstation preset by using 
firewall_myservices and firewall_allowservices. Furthermore, there is nothing 
that I could easily find in the handbook or in /etc/rc.firewall that indicates 
that the modifications to the default rules should be added to /etc/rc.conf to 
persist across reboots.

I think that there should be something in the handbook that says something 
like "configuring something like allowing inbound ssh connections to the 
workstation preset can be done by adding 'firewall_myservices="ssh"' and 
'firewall_allowservices="any"' as found in /etc/rc.firewall to /etc/rc.conf" 
would be helpful. Or there at least could be something indicating that all 
presets can be modified by adding rules found in /etc/rc.firewall to /etc/
rc.conf.