I sometimes use "shutdown now" to drop to single user mode then "exit" back up to try and reload/test some settings, i have noticed that PF still runs fine when doing this, am not sure about how many other "services" are running.
I use this on my main firewall as i also up the securelevel to 2 and cannot edit anything or reload much until i drop to single user mode which also drops my securelevel to 1.
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