Hi,
Imagine you have QEMU 1.7. You want to update bios, so you pull latest source. Of course roms/config.seabios-128k does not know which flags to set :(
Hmm? That is the whole point of the file, to carry the (non-default) config options ...
Latest qemu should have a up-to-date info for latest seabios release. When updating seabios to not-yet released master you better know what you are doing, I don't think there is a need to make that bullet-proof.
cheers, Gerd