Fedora 17, not possible to add kernel parameters to GRUB 2

[agraham]

The following is a workaround that allows editing of the kernel 
parameters, but you have to be careful.

At the Grub2 menu, press the 'e' to edit,

1. Move the cursor down to the linux line
2. Move the cursor across the linux line to any "space" and hit "\" then 
return (i.e create a multi-line \)
3. Repeat step 2 to until you can see the entire kernel line split 
across multiple lines (terminated with your "\" chars).

You can then edit what ever parts of the multi-line you like as normal 
and press F10 to boot.