Unlikely on the Lenovo but, as I have a pretty old X61s that has SATA, may well be possible, what's the model number? As to USB boot, you can either go into the setup menu (F2 (if no-one gave it up)) and change it or, live when booting, tap away at the F keys up from F8-F12, odds are one of those will kick the live choose-a-boot-device menu and you can select the USB drive you have plugged in then.
Hrm, just saw this ..but have you really tried all options for getting to the boot menu? Also, while I was quickly noodling around looking for which particular F-key Acer uses for live boot device choice (it's a crap with these things), I stumbled across this, it of any use to you? Also, you not have that small a screwdriver at all - or know someone with one/a set?
Got hold of a screwdriver and checked the HDD. No luck there.
The file form the link you posted I'll be able to download at a friend's house this week (website blocked at work).
More importantly, thanks to you I can now navigate and function the BIOS with my eyes closed.