Ahem... and this comes from a former computer professional who hated the security guys... who always said (and not joking about it...) there jobs would be far easier if we all didn't have computers...

If you are so concerned about your security that you're worried someone will break into your home and boot your computer in safe mode... then don't keep sensitive information on your computer... and get a safe, a big safe that can't be carried out the door.

I suggest not sweating over the BIOS loophole.