I can't understand it being a problem. If the Tour de France boys can do hundreds of km's a day, for days on end without issue then I don't see a need. It''s not even like they use a cleat system as on normal flat pedals there's an element of freedom anyway. That's not even taking into account that the pedals will absorb a small portion of your energy output while pedalling. Fixing a problem that doesn't exist?...
Edit: And thinking about it some cleats have float built in anyway which at least allow rotational movement if not lateral.