Debian has a # kopt=foo bar baz line in its menu.lst file, which when parsed by update-grub, includes foo bar baz as the kernel options for all the kernels. Fedora lacks this option, making it difficult to add default options to any newly-installed kernel. Or is there another way?
When updating kernels, we copy the options from the current default kernel. So instead of some magic line, just add to the current default and the options will get picked up for future new kernels