On my mac I have VMWare Fusion installed with two virtual machines, one windows xp and one linux xubuntu.
I would like to boot xubuntu VM from an ISO but the bios splash screen is really fast on VMWare :)
So I found this trick to force the VM to enter in BIOS configuration.
Go to the VM file, show package content, edit the file .vmx adding this line:
bios.forceSetupOnce = “TRUE”
That’s all! On the next boot the VM will go into the BIOS configuration .. useful! :)