Actually the BIOS admin bit is quite rare these days, I think a few of the older Compaq's had that, and my very very old 286 Tosh did.
My very modern Thinkpad still does it!
Really ?
I know that the thinkvantage stuff is run from the hard drive when you press the magic blue button at POST, but if this stuff is not present I am pretty sure it just falls back to the BIOS setup rather than the thinkvantage menu. At least that is how my R40 behaved when I removed the original disk.