From owner-freebsd-hackers@FreeBSD.ORG  Thu Jun  7 14:31:44 2012
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Date: Thu, 07 Jun 2012 07:29:26 -0700
From: Doug Barton <dougb@FreeBSD.org>
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To: Gleb Kurtsou <gleb.kurtsou@gmail.com>
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Cc: Konstantin Belousov <kostikbel@gmail.com>, freebsd-hackers@FreeBSD.org,
	Andriy Gapon <avg@FreeBSD.org>
Subject: Re: boot menu option to disable graphics mode
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On 06/07/2012 02:57 AM, Gleb Kurtsou wrote:
> What do you think about adding generic support for overriding *_enable
> options in rc.conf?
> 
> I'd like to be able to disable services at boot prompt, e.g.
> # set rc.slim_enable="no" -- overrides slim_enable="yes" in rc.conf
> 
> Similarly rc.pf_enable="no"
> 
> Then introduce x_enable knob (=yes by default) to disable login
> managers. User will be able to override this setting with
> # service xdm forcestart

Why not just:

boot single user
fsck -p
mount -a
$EDITOR /etc/rc.conf[.local]