chromium-os-dev is prob better for this
please file a bug at
crbug.com/new and let us know the # so we can flag it
i don't know of the status of SeaBIOS on kip (rambi based devices), but they were supposed to work. could be that your firmware does not include it. how do you know that "It seems to have SeaBIOS ability" ? if you hit CTRL+L, it shouldn't have beeped, it should have gone to a different screen.
note that CTRL+U won't boot non-CrOS images, only CTRL+L will
-mike