I was also wondering that..... any solution for that so far?
I have the same problem with a Gigabyte motherboard BIOS that wants a DEL key to enter the BIOS settings. I am using a compact wired Aluminum Apple keyboard. I can press F12 fine to get to the startup device selection menu, but the Apple keyboard does not know how to generate the traditional DEL key to enter BIOS settings. Any help? I hate keeping a cheap USB Windows keyboard just to enter BIOS settings!