An extra benefit of doing this is that both hands still have access to the full key set. It would be useful to re-assign the extra keys to other functions, but

An extra benefit of doing this is that both hands still have access to the full key set. It would be useful to re-assign the extra keys to other functions, but this seems non-trivial to do cross platform in software. Would be a nice project to make a little hardware box to combine two keyboards into one, with a little OLED screen for setting shortcuts.