I'm confused. You say you want the numlock on because you sometimes need to mess with BIOS settings, which for some reason you can't (or don't want to) do via IPMI. But FreeNAS won't have booted yet when you're in the BIOS, so nothing FreeNAS does will affect this. And the only time you'd need to use the console at all is if there were no configured network interfaces. I know that doesn't really answer the "how" question, but the more I hear, the more I'm confused about "why".