I totally agree that it is much safer and wiser to keep booting this way with the nightly builds. For what I see here on the forum many people with little knowledge, including myself, of what they are actually doing are experimenting with the magic of RAW from their canon camera. To protect these people and their precious camera's I completely agree that it is much wiser to keep working this way.
But what I was referring to, is that would be nice to return the camera to it's original state, being unable to use ML, but without the checking for bootdisks and thus starting up as fast as it was. For this it would be lovely if someone wrote something that turns the bootflag off again.