From The FreeBSD Handbook...
Quote:
7.6.2 Single-User Mode
This mode can be reached through the automatic reboot sequence, or by the user booting with the -s option or setting the boot_single variable in loader.
It can also be reached by calling shutdown(8) without the reboot (-r) or halt (-h) options, from multi-user mode.
If the system console is set to insecure in /etc/ttys, then the system prompts for the root password before initiating single-user mode.
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Which shouldn't touch your Resource Configuration stuff so you should be able to edit your broken rc.conf.
Regards
ed