I have a lot of different firewall rules I add. To make them a little easier to maintain, I separate them into multiple files and add a specific config include section to /etc/config/firewall to run each script.
I tend to put them in their own folder /etc/firewall.d, otherwise they clutter up the /etc folder.
It would be nice if, instead of using the config include directive, fw3 could simply scan the folder /etc/firewall.d and execute any scripts it finds there.