I always thought the beeping came from your pc speaker and was determined by your bios. Then again in that fadora howto which uses a 2.6 kernel with a modular speakup, they use a --with pcspkr option. I don't see why you can't pass that option at the end of where you put the kernel line or actually I think that goes on the line after the kernel line. I don't know, the grub documentation never gave an example of a file with special kernel peramiters, then initrd lines then lines specifying modules. What I do, is set the delay really high If I need to type something in, something like ttimeout 30.